Hi MJ_786_459,
Thanks for posting in the community.
According to your description, I assume the excel workbook stored in Windows Server and when you open it, the error message always pops on. If the workbook is stored in an online drive, like SharePoint, please point out and let me know.
If so, please try the following suggestions:
- Please open Excel, click File> Options> Save, under Cache Settings, tick the option “Delete files from the Office Document Cache when they are closed” and click Delete cached files. After that, reopen Excel and open the workbook again.
- Please try the steps in this article.
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- Here are the references that may help you
Also, if the issue still exists, I would like to collect more information.
- Does this behavior in other files? If not, please make a copy of the affected workbook (click File> Save as and save with a different name). After that, check again.
- Have you enabled the feature Share Workbook (Legacy)? If so, please disable the option “Use the old shared workbooks feature instead of the new co-authoring experience”
If you have any updates, please feel free and come back to share with us.
Regards,
George