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Excel Online App Request Was Taking Too Long -open this in the desktop app
I have a fairly large workbook that has been working absolutely no problem up until this past weekend, where it will not open in the Excel online app. It opens on the desktop app just fine. Nothing...
The solution for us was to re-create the file from scratch, no copy - paste. 700 thousand formulas...
If your file doesn't have formulas, you could try copy and paste values over to a new sheet.
I recommend using the Help, Feedback button to send feedback to Microsoft about this.