Hi,
Where did you save the Workbook?
Did this problem appear for all users or specific user?
In Excel open a Workbook: TEST.xlsx it will create a temporary lock file automatically (Microsoft calls it an "owner file"): ~$TEST.xlsx, if you don't have delete permission for the folder you will not delete the lock temporary file. This is an hidden file, try to unhide files and check if you can find the temporary file there, delete it manually.
Make sure the user have delete permission for accessing the folder.
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