I can’t work emails and teams on my phone

Teams and work email on the phone are repeatedly asking for authentication because access is being challenged and the apps need a fresh sign-in to restore access.

Use these steps on the phone:

1. When the banner or prompt appears in Teams or Outlook, tap Sign in and complete the sign-in, including any multi-factor authentication (MFA) such as Microsoft Authenticator, SMS, or phone call.
2. If no sign-in button appears, fully close the app and reopen it:
   • Force-quit Teams and Outlook.
   • Open them again and follow the sign-in prompts.
3. Make sure the phone is on the network required by the organization:
   • If a VPN is required, connect to it before opening Teams or email.
   • Avoid switching between mobile data and Wi‑Fi or between different Wi‑Fi networks while using Teams and email.
4. Keep the apps updated:
   • Update Microsoft Teams and Outlook to the latest version from the app store.
5. If MFA codes are not being received (SMS or email):
   • Avoid repeatedly requesting codes, as excessive requests can cause temporary blocking.
   • Check if SMS from unknown numbers are blocked on the phone and adjust settings.
   • Check junk/spam folder for verification emails from @accountprotection.microsoft.com.
   • Verify that the phone number and email used for verification are correct by signing in to the Security info page and selecting Update info if possible.
6. If sign-in prompts keep returning even after successful sign-in, or if the device is reported as out of compliance or blocked, contact the organization’s IT admin so they can:
   • Check conditional access policies (VPN, device compliance, sign-in risk).
   • Reset MFA or require re-registration of authentication methods if needed.

If the account is a Teams Free (personal) account, the same app steps apply: sign in again from the banner, ensure stable network, avoid network switching, and keep the app updated.

References:

• Restore your access to Microsoft Teams
• Restore your access to Microsoft Teams Free
• Why am I having trouble signing in to Microsoft Teams?
• Common problems with two-step verification for a work or school account
• How to add your accounts to Microsoft Authenticator