Hello there,
This is likely to be a profile issue on the PC where the user is seeing the issue. I suggest deleting the profile and then allowing it to be recreated on the next login. Then try the process again and see if the issue is resolved. You can go to %SystemRoot%\System32\winevt to find relevant logs during the period when you encountered your problem.
The below thread discusses the same issue and you can try out some troubleshooting steps from this and see if that helps you to sort the Issue.\
File server not showing user permissions, advanced settings greyed out https://learn.microsoft.com/en-us/answers/questions/472559/file-server-not-showing-user-permissions-advanced.html
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