A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hello, thank you for reaching out to Microsoft Q&A.
According to the Microsoft article below, editing documents or spreadsheets in Office apps is allowed on devices with a screen size below 10 inches.
What you can do in the Microsoft 365 apps on mobile devices with a Microsoft 365 subscription
If you are suddenly being asked to subscribe on a device with a screen size below 10 inches, this may be a temporary issue with the application.
Could you please confirm if you are experiencing the same problem with all files? Also, do you have the necessary permissions to edit these documents?
What is the file format of the Excel files - are they in .xlsx format or the older .xls format? See if you can copy all the contents and paste them into a new Excel spreadsheet so you can edit there.
Meanwhile, if you have already tried uninstalling and reinstalling the apps, please also try restarting your mobile device, clearing all data for these apps in the app settings, then reinstalling the app again and signing in with your Microsoft account.
Let me know if you still need more help.