Sync fails with Windows client

Hi @mhoeher,
Since Version 3.31.1 the windows client gets an error synchronising with WebDAV (luckycloud):

{"message":"Starting synchronization " "time":"2021-02-05T08:11:13.256Z" "type":"Debug"} {"message":"Creating remote root folder " "time":"2021-02-05T08:11:13.259Z" "type":"Debug"} {"message":"Failed creating remote directory: Error transferring - server replied: Service Unavailable " "time":"2021-02-05T08:11:13.390Z" "type":"Error"} {"message":"Finished synchronization " "time":"2021-02-05T08:11:13.391Z" "type":"Debug"}

The android version of 3.31.1 is working well.

Cheers