PermissionDenied to documents folder

Hi,

I am having this rare issues, where a handful of my users are crashing when trying to access their realm file. This is the error I'm seeing:

Fatal error: 'try!' expression unexpectedly raised an error: Error Domain=io.realm Code=3 "Failed to open file at path '/var/mobile/Containers/Data/Application/BCA5E4BC-5923-4D7E-8142-AB49B32A7E59/Documents/default.realm.lock': Operation not permitted" UserInfo={Error Code=3, NSFilePath=/var/mobile/Containers/Data/Application/BCA5E4BC-5923-4D7E-8142-AB49B32A7E59/Documents/default.realm.lock, Error Name=PermissionDenied, NSLocalizedDescription=Failed to open file at path '/var/mobile/Containers/Data/Application/BCA5E4BC-5923-4D7E-8142-AB49B32A7E59/Documents/default.realm.lock': Operation not permitted}

and I can report that for all for those users, it seems that identiferForVendor has returned nil. So it looks like that's the common denominator.

Any idea on what other data I can log or what's the issue here?

Thanks..!