New Phone Issues

Hi @Teacher In Need Of Help,

Thanks for posting your question to Microsoft Q&A Forum.

The error code 5objn you are encountering appears to be caused on this specific device, especially after device migrations, app updates, or when cached credentials conflict with the authentication flow.

The most likely solution is to clear the credentials cache that’s causing the conflict. I'd recommend you clear your device cache credentials first to ensure proper sign-in:

1. Remove old accounts from device settings

• Go to Settings → Accounts → Manage accounts.
• Delete any duplicate or old Microsoft/Work accounts.

2. Clear Outlook app cache and data

• Settings → Apps → Outlook → Storage → Clear Cache & Clear Data.

3. Reinstall Outlook

• Uninstall Outlook → Reboot → Turn off Auto Sync Data → Reinstall from Play Store/App Store.
• You can find Auto Sync Data at the bottom of the Manage accounts page.
  

4. Sign in using the full UPN format

• For work accounts, login with your @onmicrosoft.com account or your organization’s domain.
• This forces a fresh authentication session.

I hope this helps you regain access to your account quickly. I'm glad to assist and truly hope the information provided has been useful. Please feel free to reach out anytime if you need further assistance.   

Looking forward to your response and wishing you a great day ahead.  

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