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I'm replying to this old thread because I'm having the same issue with an Excel file in a shared onedrive folder. The only thing I can tell that's different in this file then all the others is it uses the date function "Today()" in several cells. It's possible that or some other function that gets updated when the file opens has something to do with it. I'm experimenting by setting calculate to manual. Then I'll adding the function to other spreadsheets that don't have it just to see if the error pops up for those files.