Teams sign-in loop after MFA enrollment

Minimal guidance for messy support realities.

Scenario

A user enrolls in MFA and then Microsoft Teams repeatedly asks for sign-in or closes the prompt after entering credentials.

Recommended Resolution Path

  1. Verify Conditional Access is not forcing a registration step the user never completed.
  2. Clear Teams cached app data and the WAM token cache, then restart the device.
  3. Test sign-in at office.com to confirm tenant-side auth is healthy.
  4. If the user recently changed phones, confirm Authenticator backup and re-registration were completed.

Technician Notes

Confirm the business impact, document the root cause, and capture any preventative follow-up in the PSA or client knowledge base.