Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Since reinstalling did not help and the issue only affects Microsoft 365 desktop apps, the next supported fixes are local sign-in and app repair steps.
- Restart Windows, then sign back in and try Excel again.
- Repair Microsoft 365.
- Windows 11: Start > Settings > Apps > Apps & features > select Microsoft 365 > Advanced options > Repair. If that does not help, use Reset if available.
- Windows 10: Right-click Start > Apps and Features > select Microsoft Office/Microsoft 365 > Modify > choose Online Repair > Repair.
- Note: this repairs the full Office suite, not just Excel.
- Check the work or school account connection in Windows.
- Open Settings > Accounts > Access work or school.
- If the school account is listed, disconnect it, then connect it again and sign in with the school account.
- Then open Excel and try signing in again.
- If the sign-in error is specifically Something went wrong [1001], two known causes are documented:
- security software interfering with the Microsoft.AAD.BrokerPlugin sign-in component
- user profile management issues, including roamed profile data causing authentication data to become invalid
- For temporary relief for the [1001] sign-in issue, restart the device. Microsoft also documents a WAM repair in user-mode PowerShell:
Add-AppxPackage -Register "$env:windir\SystemApps\Microsoft.AAD.BrokerPlugin\_cw5n1h2txyewy\Appxmanifest.xml" -DisableDevelopmentMode -ForceApplicationShutdown
Add-AppxPackage -Register "$env:windir\SystemApps\Microsoft.Windows.CloudExperienceHost\_cw5n1h2txyewy\Appxmanifest.xml" -DisableDevelopmentMode -ForceApplicationShutdown
- If Office still fails to start or sign in after repair, uninstall and reinstall Microsoft 365 using the Microsoft uninstall troubleshooter, then reinstall Office.
- If installation or reinstall is blocked by proxy, firewall, antivirus, or connection issues, use the Microsoft 365 offline installer.
- Error “Something Went Wrong [1001]” signing in to Microsoft 365 Desktop Applications | Microsoft Support
- "Something went wrong" error when you try to start a Microsoft 365 app | Microsoft Support
- "Something went wrong" error when you try to start a Microsoft 365 app
- Access work or school troubleshooter for restoring access to M365 desktop applications | Microsoft Support