No Nextcloud Sync: MKCOL /remote.php/webdav/Joplin/.sync/ HTTP/2.0


I can`t sync Joplin zo Nextcloud anymore. Neither on iOS, Android or various Win 10 PCs it is possible.

I allways get MKCOL /remote.php/webdav/Joplin/.sync/ HTTP/2.0

All iOS, Android and Win 10 devices/ machines run the latest Joplin Version

Nextcloud is 18.0.4.

Any ideas how to solve that?