A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi! Mike. Thanks for the details. You've done the basic steps to troubleshoot it, this time force Excel to Reset Completely, it's different from reinstalling it.
Delete all Office apps (Excel, Word, PowerPoint, OneDrive).
Go to Settings → General → iPhone Storage, confirm all caches are gone.
Restart your iPhone.
Reinstall Excel first, open it, and sign in before reinstalling the others.
See if this helps. If you need further assistance, just let me know.
Best regards,
Kimberly