When we open the document in desktop app, click File> Info to check if there is any required property with asterisk.
If so, please fill in the property then compare the result.
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@Alex Mathew ,
Try to use the Document Inspector to resolve this. It is used to remove unwanted information:
Here's how:
Simialr issue:
https://answers.microsoft.com/en-us/msoffice/forum/all/required-properties-preventing-save/c9a27e35-6d3c-438f-b911-876f37a1e593
@Alex Mathew ,
Is there any progress on this issue?
Please feel free to reply.