Thanks for the update!
HTTP 405 Method Not Allowed
So I’m trying to connect DAVX5 with a Nextcloud service on an onion address but run into some problems. I’ve got version 188.8.131.52 of DAVX5 from Fdroid and version 15.0.7 of Nextcloud. And as I said I’m running it as hidden service so I need to connect to an .onion address and on the same device I’ve got Orfox and with I can connect to the onion address. But not with DAVX5. I get HTTP 405 Method Not Allowed. When I look into the apache logs on the server there is nothing special there at all.