Desktop Client 3.4.1 errors only on one Windows 21H2 machine (other clients working)

[Mornsgrans]

There are several threads concerning problems with desktop-client 3.4.x under Windows.

Temporary solution:

Windows Client 3.4.1 - Sync not working

Same to me, I installed the 3.3.6 version from here https://download.nextcloud.com/desktop/releases/Windows/ and the sync works again. Seems it has something to do with the new way of syncing the devices.

Don’t forget to disable the automatic search for updates in the settings, if enabled.