Managing personal Outlook.com account settings, security, and privacy
Dear Joseph Bertrand-Marquet,
Thank you for posting your question to the Microsoft Q&A forum and for trying those initial troubleshooting steps. Since you have already tried the basics with no result, this tells us the issue is likely not with the app installation itself, but rather a "silent" conflict with your phone's internal clock or the account token on the server side.
Here are the advanced steps to resolve this synchronization issue.
Step 1: Force a Time Sync
Authentication codes are highly time-sensitive. Even a discrepancy of a few seconds can cause them to fail.
- For Android: Open the Authenticator app > go to Settings > select Time correction for codes > tap Sync now.
- For iOS: Go to your iPhone Settings > General > Date & Time. Toggle "Set Automatically" OFF, wait 5 seconds, and toggle it ON again to force a recalibration.
Step 2: Check Network and Notification Settings
Sometimes network firewalls or focus modes block the signal.
- Switch Connections: If you are on Wi-Fi, switch to Mobile Data (or vice versa) and try again.
- Focus Mode: Ensure Do Not Disturb or Focus Mode is turned OFF, as this can suppress the approval pop-up.
Phase 2: If the App Still Fails
If the steps above cannot resolve the issue and you do not have a backup email or phone number set up, you will need to start a recovery process.
- Go to the login screen.
- When asked for the code, select the link "I don't have any of these".
- Follow the prompts to replace your security info.
Warning: This triggers a mandatory 30-day security waiting period. Microsoft does this to prevent hackers from locking you out. You can still access email on trusted devices, but you cannot change security settings for 30 days.
Note: If you are using a Work or School account, you will need to reach out to your IT Administrator and request them to "Re-register MFA" for your account.
I hope these steps help you regain access. Please let me know if you have further questions.
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