Verifier codes not working

Question

Verifier codes not working

Tom Aiken 0

Won’t recognise authentication app codes when trying to sign in to my email accounts on outlook app

Pauline Mbabu 1,835 Reputation points Microsoft Employee

2026-04-11T04:23:47.0266667+00:00

Hello Tom,
Thank you for reaching out.
When authenticator codes suddenly stop working across multiple apps and both work and personal accounts even though the app was working recently and you haven’t changed phones; the most common cause is a time sync issue on the phone, where the device clock is slightly out of sync, causing all time‑based codes to be rejected. Fix this by toggling automatic date/time and time zone off, restarting the phone, then turning them back on, and also using Microsoft Authenticator → Settings → Time correction for codes → Sync now; then wait for a new code cycle and try again. This scenario is usually not a hack, since compromises don’t typically break all accounts at once. Only if this fails should you use alternative sign‑in options or contact your work IT admin for MFA reset assistance.

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Pauline Mbabu 1,835 Reputation points Microsoft Employee

2026-04-11T04:23:47.0266667+00:00

Hello Tom,
Thank you for reaching out.
When authenticator codes suddenly stop working across multiple apps and both work and personal accounts even though the app was working recently and you haven’t changed phones; the most common cause is a time sync issue on the phone, where the device clock is slightly out of sync, causing all time‑based codes to be rejected. Fix this by toggling automatic date/time and time zone off, restarting the phone, then turning them back on, and also using Microsoft Authenticator → Settings → Time correction for codes → Sync now; then wait for a new code cycle and try again. This scenario is usually not a hack, since compromises don’t typically break all accounts at once. Only if this fails should you use alternative sign‑in options or contact your work IT admin for MFA reset assistance.

Answer 1

When Outlook or Microsoft sign-in does not accept verification codes from an authenticator app, the issue is usually with how the sign-in page or security info is configured, not the code itself.

Try these steps depending on the scenario:

Confirm the correct account and method

Make sure the email address used to sign in is exactly the one configured in the authenticator (correct domain such as .com vs .co.uk, and correct spelling of the name).
If the sign-in page offers a phone or email option that is not recognized, verify that the domain and name are correct. If they are correct but still not recognized, account recovery may be required.

Use an alternate verification method if available

If another method is configured (SMS, alternate email, or a different app), choose that instead of the authenticator code and sign in.
After signing in, go to the Security basics page and select Update info to review and fix the security methods, or choose I don't have any of these to replace security info if needed.

If verification codes are not arriving

If the sign-in flow says a code was sent (SMS or email) but nothing arrives, follow the guidance for missing verification codes:
- Sign in to the Security basics page, select Update info, and choose a method that works or I don't have any of these to replace security info.
- If using another Microsoft email (Outlook/Hotmail/Live/MSN) as the alternate address, use a private/incognito browser window so both accounts can stay signed in while retrieving and entering the code.

If the phone/email shown is not recognized

If the phone or email offered for verification is not recognized, confirm:
- The correct email domain is used (for example, .com vs .co.uk).
- The email name is typed correctly.
If the address is correct but the security info still looks wrong, use the account recovery process.

If completely locked out by two-step verification

If no verification method works and sign-in is blocked by two-step verification, use the account recovery flow and provide as much accurate information as possible, or contact support as described in the referenced guidance.

If this is a work or school account and the authenticator is the only method and cannot be used, an administrator may need to reset multifactor authentication settings so the account can be re-registered in the app.

References:

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Verifier codes not working

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