Upgraded iMac to Big Sur today and since then, my oulook 365 cannot log into my account. Other 365 apps are fine. I get'No Credentials' The system requires that you sign in to a valid account. The error code is 0xD000000C.
Any suggestions...?
Greetings sparkercb,
Thanks for visiting the Apple Support Communities! It seems you're running into an issue with your Microsoft account not being recognized in Outlook 365.
Microsoft has the following support article to troubleshoot the same error code: Error 0xD000000C when activating Office for Mac - Office Support
Reach out to Microsoft for assistance and information if the issue persists:
Kind regards.
Big Sur and outlook 365
