[itSupportX]

Hello
I am Nold, I work in IT support and a customer has approached me with a problem.
He uses MobileSheets on the tablet and on the laptop.
The problem is that he cannot synchronize the data on the laptop to onedrive.
The onedrive account is stored and I can import data from onedrive.
When I select synchronize to onedrive, I can select the destination in the onedrive folder structure. as soon as I click on start, the question appears: no library found. Do you want to use the library of your device? and when I click on yes, the sync process begins.
The first line says: transferring data for song: *songname*
Then it goes on for about 10 minutes and then it says: error encountered transferring files: c:\users\***\appdata\local\packages.......
What is going wrong here?

Thanks for the support.

Windows 11 Pro
What I have tried:
Uninstalled/installed MobileSheets (3x)
Firewall deactivated
Exclusion of c:\program files\windowsapps
All Defender functions deactivated
Moved the notes folder from c:\users\***\appdata\...... to c:\notes
Sync directions adjusted

The customer has music colleagues for whom it works and they have compared all settings

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