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Hi,
Nice to meet you! I'm Randy, an Independent Advisor.
Try first saving the Excel file directly to your desktop or another local folder (outside OneDrive) to confirm if the problem only happens with cloud sync; if it saves fine, the issue is with OneDrive. Next, turn off Autosave in Excel and in OneDrive settings disable "Use Office applications to sync files I open", which often causes temp file renaming. If the issue continues, reset OneDrive by pressing Win+R, typing onedrive /reset, and then signing back in, and finally make sure your Office is fully updated.
Hope that this helps,
Kind regards,