Hi Gagak Angkasa,
Based on your description, it seems that the users cannot save the file normally.
Did this issue appear all Excel files or a particular file? How about Word, PowerPoint?
First please check if they open the file in read only mode.
Then please check if the permission for these users is limited, please provide the full permission to these users and then check the result.
Please refer to my suggestions first and check your environment.
Any updates please let me know, and please provide more information about your issue. I'm glad to help you.
Regards,
Emi Zhang
TechNet Community Support
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