How to Fix Azure Portal Sign-In Stuck in an MFA Authentication Loop
Question details
The user is unable to sign in to the Azure portal because their service account is caught in an endless multi-factor authentication loop.
- Product
- Azure Portal
- Device & OS
- not provided
- Scenario
- Attempting to access the Azure portal using a service account paired with the Microsoft Authenticator app.
- Observed behavior
- The system triggers multiple Authenticator requests, but the second approval never arrives. Additionally, one-time codes generated by the Authenticator app are repeatedly rejected.
Ensure you have your standard account password on hand and know how to contact your Microsoft 365 administrator, as they may need to reset your multi-factor authentication settings.
Bypass with Password and Reset MFA Registration
Use your account password to bypass the broken Authenticator prompt and have your administrator reset the MFA configuration.
When a service account gets stuck in an authentication loop, usually due to directory branding or tenant overlaps, the Authenticator push notifications can fail. Bypassing the push notification to use a password and resetting the MFA configuration is the most effective solution.
On the Microsoft sign-in screen, click on 'Use your password instead' or 'Sign in another way' when prompted for the Authenticator app approval.
Enter your standard service account password to bypass the stalled multi-factor authentication loop and access your account.
Contact your Microsoft 365 administrator to verify your service account's domain and primary alias to ensure there are no directory conflicts causing the loop.
Ask your administrator to reset the MFA registration for your account in the Azure Active Directory portal. This will clear the corrupted settings and force a new setup.
Upon your next login, follow the on-screen prompts to scan the new QR code and add the service account back to your Microsoft Authenticator app.
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Frequently Asked Questions
Why does Microsoft Authenticator reject my one-time codes?
This often happens if the time synchronization on your mobile device is slightly off, or if the authentication loop is trying to verify against a different Azure directory than the one your app is generating codes for.
Can I fix an MFA loop without contacting an administrator?
Usually, no. If your account is stuck in a loop and you cannot access the security info page (mysignins.microsoft.com), an administrator must clear your MFA sessions from the Azure backend.
Why am I getting multiple Authenticator prompts for one login?
Multiple prompts typically occur when your service account is tied to multiple directories or when custom directory branding triggers redundant authentication checks across different Azure tenants.
