A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Many users are currently reporting the same issue. Can you check whether your license or subscription is listed as Active in your Microsoft account: https://account.microsoft.com/services?
If it is, I suggest trying an Online Repair to thoroughly repair any issues with the Office installation:
In the search bar, type Control Panel > Programs and Features > find Microsoft 365/Office > right-click it > select Change > then run Online Repair.
If the issue persists, please answer the following questions to help determine what may be causing the problem:
- What changes did you make to your computer or subscription before the issue started?
- Is this issue only occurring when you open Excel, or does it also affect Word and PowerPoint?
- What exact error message do you receive when you try to open Excel?