Hi, Pride Ents
Good day!
Thank you for posting to Microsoft Community. We are happy to assist you.
According to your description, I'm sorry to hear that you're having trouble with the authentication app. If you have access to the mailbox through the web, you can try resetting the authentication app.
Here are the steps:
- Go to the Security settings page for your Microsoft account: https://account.microsoft.com/security/
- Under the "Security info" section, click on "Add a new way to sign in or verify"
- Select "Mobile app" as the method, and then select "Authenticator app"
- Follow the prompts to set up the app again on your new phone. You may need to scan a new QR code to set it up.
Once you have set up the authentication app again, you should be able to log back into your Outlook app.
If the issue persists, would you like to talk with Microsoft Data Protection directly? Unlike us, for this team which has higher permission that they would able to reset it on the backend for you.
To get in touch with Microsoft Data Protection team, please hotline with - Find Microsoft 365 for business support phone numbers by country or region - Microsoft 365 admin | Microsoft Learn. (Ctrl+F4 and type your area's name.)
Thanks for your precious time and your understanding would be highly appreciated.
Hope you all the best!
Sincerely,
Alex | Microsoft Community Moderator.