I can't sign in to PowerPoint

Try the following steps on the Mac to resolve sign-in issues with a single Office app like PowerPoint when Word and Excel work:

1. Quit all Office apps (Word, Excel, PowerPoint, Outlook, OneNote).
2. Remove the Office apps:
   • Open Finder → Applications.
   • Use Command + click to select all Microsoft 365/Office for Mac apps (Word, Excel, PowerPoint, Outlook, OneNote).
   • Ctrl+click the selection and choose Move to Trash.
3. Remove Office app data for a clean reinstall:
   • In Finder, select Go → Go to Folder… and enter: ~/Library/Containers/
   • Delete the folders starting with:
     • com.microsoft.Word
     • com.microsoft.Excel
     • com.microsoft.Powerpoint
     • com.microsoft.Outlook
     • com.microsoft.OneNote
   • Go back to Library, open Group Containers, and move these (if present) to Trash:
     • UBF8T346G9.ms
     • UBF8T346G9.Office
4. Reinstall Office from the account that owns Office Home 2024:
   • Sign in at the services page for the Microsoft account used to purchase/activate Office.
   • Download and run the Office installer from there.
5. After installation, open Word first and sign in with the same account. Once Word is activated, open PowerPoint and confirm it now signs in and activates correctly.

If PowerPoint still cannot sign in while Word/Excel work, check for any emerging Mac-specific installation or activation issues and follow the troubleshooting steps for Office for Mac.

References:

• What to try if you can't install or activate Office for Mac
• Microsoft Office apps for Mac quit unexpectedly - Microsoft Q&A
• I just bought Office for Home and Business and now "No license found" - Microsoft Q&A
• Why do I need an account to sign in to Microsoft 365 or Office?