Three methods qualify as phishing-resistant. The push notification your organization relies on is not one of them.
Three combinations qualify for the built-in phishing-resistant strength, and only three: Windows Hello for Business or an equivalent platform credential, a FIDO2 security key, and certificate-based authentication in its multifactor form. Push approval through Authenticator clears both the MFA and passwordless bars. It does not clear this one, because nothing in a push ties the approval to the page that asked for it.

- Three methodsWhat the built-in strength actually allows
- Three strengthsMFA, passwordless, phishing-resistant
- Entra ID P1The license Conditional Access requires
- Custom allowedWhere the built-in set does not fit
Seven questions that determine whether what you have deployed is genuinely phishing-resistant.
The whole test is whether the method and the page can see each other
The strength is defined as covering methods that require a genuine interaction between the credential and the surface asking for it. That single idea explains everything else. A code, a push or a prompt has no notion of where it is being presented, so it can be relayed to a page the attacker controls. A credential bound to the origin cannot be relayed, which is why so few methods make the list.
FIDO2 security keys and passkeys
First of the three that qualify, and the only one that clears all three built-in strengths at once. For most American companies this ends up being the answer for administrators, for anyone without a managed Windows machine, and for people who have to sign in from a shared or unmanaged computer.
Windows Hello for Business or a platform credential
Second on the qualifying list, and easily the pleasantest to use, because it is already the gesture people make to unlock the machine in front of them. It clears every strength. The limitation is reach: it only helps where the hardware supports it and the device is enrolled, which in most estates leaves a group of people needing something else entirely.
Multifactor certificate-based authentication
Third on the list, and the reason companies already running a certificate authority frequently arrive at phishing-resistant sooner than they thought possible. Read the qualifier carefully though, because only the multifactor variety counts. The single-factor form sits in the published table satisfying none of the three strengths at all.
Authenticator push does not qualify, and that surprises people
Phone sign-in through Authenticator clears MFA and passwordless and does not clear phishing-resistant. Nor does a Temporary Access Pass, a password plus a second factor, federated multifactor, or SMS. For most American companies that means what they built two years ago is genuinely good, and genuinely not what this asks for.
Built-in strengths update themselves, custom ones do not
The built-in strengths are permanently present, cannot be edited, and gain new methods as Microsoft adds them. A custom strength lets you name precisely which combinations you will accept, which is handy while you are in transit, and the price is that you now own its upkeep. Our habit is built-in for where you are going and custom only for how you get there.
Strengths apply per scenario, not per tenant
The supported scenarios are set out plainly: a specific method for a sensitive resource, for a sensitive action within an application using authentication context, for access originating outside the network, for accounts flagged as high risk, and for guests reaching your tenant alongside your cross-tenant settings. Between them, those are what make a staged rollout achievable.
None of this prevents somebody typing their password into a fake page.
It is stated plainly in the documentation, and it changes what you can honestly say about credential theft afterward.
- The wording is worth quoting: policies are evaluated only after the first authentication has happened, so a strength places no restriction on that initial step. The password can still be typed. What follows is that a phishing-resistant method, a security key for instance, has to be presented before anything else proceeds.
- In practice, then, a harvesting page still walks away with the password. What it cannot do is finish the job, because the factor that follows is tied to the origin and simply will not function on the attacker page.
- That remains a very large improvement, and it is the reason this is worth the work. It does mean, however, that password hygiene, leaked credential detection and identity protection stay on the list rather than coming off it.
- Reaching a genuine absence of passwords means deploying passwordless alongside the strength. That is a separate piece of work that sits well next to this one, rather than something the Conditional Access control produces by itself.
Four things that get an organization to phishing-resistant without an outage.
We build the emergency access position first
Demanding this strength of administrative roles is precisely the change capable of shutting out every administrator simultaneously. So the emergency accounts, cloud-only, registered with a qualifying method and excluded from anything that could block them, come into existence before the policy is written, not during the incident afterward.
Scope follows the people and the resources, never a date somebody picked
Strengths were built to be scoped, and the supported scenarios are set out in full. Administrators first, then whoever has a device capable of Windows Hello, then everybody remaining. Switching this on across the tenant on day one produces a help desk queue that gets the project canceled, which leaves the company further back than a slower approach ever would.
We size the key requirement honestly and early
Anyone with neither a Hello-capable device nor a certificate infrastructure behind them needs a physical key, and keys bring purchasing lead times, the logistics of getting them into hands, and a process for the day somebody loses one. Counting that group in the first week is what stops the schedule becoming fiction.
We brief the service desk on the behaviors that generate calls
Two are worth knowing about. If the strength calls for Windows Hello and the person signed in with a password, no prompt appears at all: they have to start the session again and pick a different option. And where a strength and a sign-in frequency are both in force, each can be satisfied at a different moment, which produces behavior that looks broken and is documented.
Four phases, and administrators go first for a reason.
- 01Weeks 1 to 2
Administrators and emergency access
Administrators go first, since there are few of them, they are worth the most to an attacker, and they are the group a relay attack is aimed at. The emergency accounts are dealt with in the same breath, because the guidance for those recommends a passkey or certificate-based authentication and they have to be kept out of any policy capable of blocking a sign-in.
- FIDO2 keys issued and registered for every administrative account
- A policy demanding the phishing-resistant strength wherever an administrative role is in play
- Emergency access accounts configured and excluded from blocking policies
- A tested rollback path before the policy is enforced
- 02Weeks 3 to 6
The managed Windows population
Windows Hello for Business delivers a phishing-resistant method with nothing to ship out and a gesture people already know, which makes this the quickest group to move across. The way it behaves around the primary sign-in gets explained to the help desk before enforcement, because otherwise it generates calls nobody was expecting.
- Windows Hello for Business enrolled across the eligible estate
- Sign-in options behavior documented for the service desk
- The policy aimed at the enrolled group specifically, never at the entire tenant
- Registration campaign run before any enforcement
- 03Weeks 7 to 12
Everyone else, and the awkward cases
Shared machines, kiosks, frontline workers, contractors, and anyone living on a Mac or a phone. This is the point where the remaining population splits three ways: those who need a physical key, those a certificate can cover because the infrastructure is already there, and those who need a narrow exception carrying a date on which somebody looks at it again.
- Security keys issued to populations without an eligible device
- Certificate-based authentication used where PKI already exists
- Exceptions documented with owner, reason and review date
- Guest access strength decided alongside cross-tenant settings
- 04Ongoing
Hold the line and close the exceptions
Registration coverage watched, exceptions actually revisited instead of quietly forgotten, and new starters registered for a qualifying method as part of joining rather than three months later. The built-in strengths pick up new methods on their own as they are added, so a policy resting on one keeps getting better while nobody touches it, which is the case for using built-in wherever it will do the job.
- Registration coverage reported monthly
- Every exception with a review date attached, and somebody who actually reviews it
- Qualifying method registered during new hire onboarding
- Custom strengths taken back out once the transition they existed for has finished
Six US situations where phishing-resistant is the right requirement.
A financial firm whose administrators are individually targeted
Administrators are few, they are worth a great deal to an attacker, and they are the obvious first wave. Requiring the strength on administrative roles, with keys kept at nominated workstations, shuts the route behind the identity compromises that do the most damage. It is also a control that firms under NYDFS Part 500 and the underwriters renewing their cyber policies now ask about by name.
A company that has already lost this fight once
Having watched a relay attack walk straight through push-based MFA, nobody asks whether any more, only how quickly. Applying the strength to the most sensitive applications first produces something defensible inside a few weeks, rather than waiting on a rollout that covers the whole estate.
A company with an existing public key infrastructure
Certificate-based authentication in its multifactor form is one of the three that qualify, so a company already operating a certificate authority for unrelated reasons often has a path here that requires buying nothing at all. The distinction to confirm is that the single-factor form qualifies for none of the three strengths.
An operator with shared and frontline devices
This is the group that causes the most trouble, because Windows Hello assumes a device enrolled to one person and anything phone-based assumes a phone. Physical keys are normally the answer, sometimes issued individually and sometimes shared under a controlled handover. Settling that before enforcement rather than during it is the whole difference between a smooth wave and a bad week.
A healthcare organization with clinical workstation sharing
Signing in and out of a shared workstation in seconds is a real clinical requirement, not a preference, and it sits badly with any method assuming one device belongs to one person. Smartcards backed by certificates, or a key issued to each clinician, are the two routes that work, and both have to be tested against how the floor actually operates rather than how it is described.
An institution protecting a subset rather than everyone
Strengths apply per policy and per resource, so a university can insist on phishing-resistant methods for the finance system, for research data and for administrative roles while leaving ordinary student access on standard MFA. That is a deliberate and defensible design, not a corner being cut.
How US organizations authenticate their people today.
| Feature | Phishing-resistant strength enforced | App push or code MFA | SMS or password only |
|---|---|---|---|
Satisfies MFA requirements | Yes | Yes | Partly |
Resists real-time relay phishing | Yes | No | No |
Resists MFA fatigue attacks | Yes | Partly | Not applicable |
Resists SIM swap | Yes | Yes | No |
Bound to the sign-in surface | Yes | No | No |
Works without a phone | Yes | No | No |
Enforced per resource or risk level | Yes | Rarely | No |
Method set updates as Microsoft adds methods | Yes, with built-in | Not applicable | No |
Rollout effort | Moderate | Low | None |
Position after a targeted phishing campaign | Held | Compromised | Compromised |
Thirteen method combinations against the three built-in strengths.
Authentication method combination
FIDO2 security key
- MFA strength
- Yes
- Passwordless MFA
- Yes
- Phishing-resistant MFA
- Yes
Authentication method combination
Windows Hello for Business or platform credential
- MFA strength
- Yes
- Passwordless MFA
- Yes
- Phishing-resistant MFA
- Yes
Authentication method combination
Certificate-based authentication, multifactor
- MFA strength
- Yes
- Passwordless MFA
- Yes
- Phishing-resistant MFA
- Yes
Authentication method combination
Microsoft Authenticator, phone sign-in
- MFA strength
- Yes
- Passwordless MFA
- Yes
- Phishing-resistant MFA
- No
Authentication method combination
Temporary Access Pass, one-time and multiple use
- MFA strength
- Yes
- Passwordless MFA
- No
- Phishing-resistant MFA
- No
Authentication method combination
Password plus something the user has
- MFA strength
- Yes
- Passwordless MFA
- No
- Phishing-resistant MFA
- No
Authentication method combination
Federated single-factor plus something the user has
- MFA strength
- Yes
- Passwordless MFA
- No
- Phishing-resistant MFA
- No
Authentication method combination
Federated multifactor
- MFA strength
- Yes
- Passwordless MFA
- No
- Phishing-resistant MFA
- No
Authentication method combination
Certificate-based authentication, single-factor
- MFA strength
- No
- Passwordless MFA
- No
- Phishing-resistant MFA
- No
Authentication method combination
SMS sign-in
- MFA strength
- No
- Passwordless MFA
- No
- Phishing-resistant MFA
- No
Authentication method combination
Password
- MFA strength
- No
- Passwordless MFA
- No
- Phishing-resistant MFA
- No
Authentication method combination
Federated single-factor
- MFA strength
- No
- Passwordless MFA
- No
- Phishing-resistant MFA
- No
Authentication method combination
QR code
- MFA strength
- No
- Passwordless MFA
- No
- Phishing-resistant MFA
- No
Five steps, and report-only mode is not skipped.
- 1
Establish licensing, current methods and eligibility
Conditional Access needs P1, so that gets confirmed before anything else. Then we establish what people currently have registered, how many devices could run Windows Hello, and whether there is already a certificate infrastructure capable of delivering the multifactor form.
- 2
Build the emergency access position
At least two cloud-only break glass accounts, registered with a method that qualifies and kept outside every policy capable of blocking or restricting a sign-in. That happens before any enforcing policy exists at all, because demanding this strength of administrators is exactly the change that locks everybody out at the same moment.
- 3
Design the policies and run them in report-only
The built-in strength wherever it will serve, and a custom one only where the transition genuinely calls for it. Bearing in mind that the require multifactor control and the require strength control cannot sit in the same policy together. Report-only first without exception, with the impact read against real sign-in data before anything is enforced.
- 4
Register the population before enforcing on them
Hello enrollment on every device that can take it, keys distributed and registered for the rest, and certificate-based authentication configured wherever the infrastructure is already standing. Each group is enforced only after it has registered, never before, and the help desk gets briefed ahead of every wave.
- 5
Enforce, then manage the exceptions down
Policies move out of report-only and into enforcement one group at a time. Every exception has a named owner, a stated reason and a date it gets looked at again. Coverage is reported monthly, and new starters register a qualifying method while they are being onboarded, which is the only mechanism that keeps the position from quietly eroding.
What US organizations ask about phishing-resistant MFA.
Fifteen checks that stop this becoming a Sunday night lockout.
Do not lock yourself out
- Do you have emergency access accounts?At least two, cloud-only.
- Are they excluded from blocking policies?Report-only policies do not need exclusion.
- Has every admin registered a qualifying method?Check before enforcing, not after.
- Is the policy in report-only first?Always, without exception.
- Who can disable the policy if it goes wrong?And can they sign in to do it.
Coverage
- Which devices support Windows Hello for Business?That population is the cheapest to move.
- Do you have a PKI already?Multifactor CBA qualifies, single-factor does not.
- How many people need a physical key?Procurement lead time is real.
- What about shared and frontline devices?Usually the hardest population.
- Are guests in scope?Strengths work with cross-tenant settings.
Policy design
- Are you mixing grant controls?Require MFA and require strength cannot be combined.
- Is sign-in frequency also applied?The two can be satisfied at different times.
- Built-in strength or custom?Built-in updates itself as methods are added.
- Are we scoping this to a resource, to a risk level, or to the whole company?Strengths are designed for scoping.
- Does the service desk know the Hello behavior?Users are not prompted, they must reselect.
The pages around this one.
Check whether your administrators could sign in tomorrow with a phishing-resistant method.
In most tenants we look at, the answer is that some could and some could not, and nobody has checked. That single question determines whether this is a two week project for privileged accounts or a three month one.
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