A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi,
To help isolate the issue:
Just to clarify, you're using Windows, not a Mac, correct?
Did you make any changes to your computer or subscription before this issue started?
Does the saving issue occur only in Excel, or does it also happen in Word? Please share any error message you see.
In the meantime, open Excel, sign out of your account, and then sign back in with the correct Microsoft account to refresh your license.