Failing sync on luckycloud via webdav

Hello, first of all thank you for this great work! I started using OpenTodoList on Android and Windows 10 (64bit) and it is not possible to sync via webdav. I get the following messages:

[[{"message":""Starting synchronization" ","time":"2020-01-07T14:39:48.434Z","type":"Debug"},{"message":""Creating the remote top level directory" ","time":"2020-01-07T14:39:48.435Z","type":"Debug"},{"message":""There was a network error: ContentOperationNotPermittedError" ","time":"2020-01-07T14:39:49.581Z","type":"Error"},{"message":""Failed to prepare remote directory '/OpenTodoList' for sync" ","time":"2020-01-07T14:39:49.581Z","type":"Error"},{"message":""Synchronization finished" ","time":"2020-01-07T14:39:49.581Z","type":"Debug"},{"message":""Starting synchronization" ","time":"2020-01-07T14:39:49.622Z","type":"Debug"},{"message":""Creating the remote top level directory" ","time":"2020-01-07T14:39:49.623Z","type":"Debug"},{"message":""There was a network error: ContentOperationNotPermittedError" ","time":"2020-01-07T14:39:50.762Z","type":"Error"},{"message":""Failed to prepare remote directory '/OpenTodoList' for sync" ","time":"2020-01-07T14:39:50.762Z","type":"Error"},{"message":""Synchronization finished" ","time":"2020-01-07T14:39:50.762Z","type":"Debug"},{"message":""Starting synchronization" ","time":"2020-01-07T14:39:53.254Z","type":"Debug"},{"message":""Creating the remote top level directory" ","time":"2020-01-07T14:39:53.254Z","type":"Debug"},{"message":""There was a network error: ContentOperationNotPermittedError" ","time":"2020-01-07T14:39:54.447Z","type":"Error"},{"message":""Failed to prepare remote directory '/OpenTodoList' for sync" ","time":"2020-01-07T14:39:54.447Z","type":"Error"},{"message":""Synchronization finished" ","time":"2020-01-07T14:39:54.453Z","type":"Debug"},{"message":""Starting synchronization" ","time":"2020-01-07T14:39:58.678Z","type":"Debug"},{"message":""Creating the remote top level directory" ","time":"2020-01-07T14:39:58.679Z","type":"Debug"},{"message":""There was a network error: ContentOperationNotPermittedError" ","time":"2020-01-07T14:39:59.882Z","type":"Error"},{"message":""Failed to prepare remote directory '/OpenTodoList' for sync" ","time":"2020-01-07T14:39:59.882Z","type":"Error"},{"message":""Synchronization finished" ","time":"2020-01-07T14:39:59.885Z","type":"Debug"}]]

My cloud provider is luckycloud. Could it be, that they handle the webdav protocol a bit differently? I could not find any solution.

Thanks and best regards