Webdav-Error on new set up nextcloud

Hello Community,

I am absolutely new to Nextcloud and am trying to set everything up correctly. I have a Nextcloud instance running as a Docker container. In front of Nextcloud is an Nginx Proxy Manager. The domain for remote access is self-hosted and points to Cloudflare. Cloudflare then connects the domain to my server.

I hope I managed to make it somewhat understandable. The problem now is that I see this error message in the Nextcloud admin area, and I have no idea where to start.

“Dein Webserver ist noch nicht hinreichend für Datei-Synchronisierung konfiguriert, da die WebDAV-Schnittstelle vermutlich nicht funktioniert. To allow this check to run you have to make sure that your Web server can connect to itself. Therefore it must be able to resolve and connect to at least one of its trusted_domains or the overwrite.cli.url. This failure may be the result of a server-side DNS mismatch or outbound firewall rule.”

The values for trusted_domains and/or overwrite.cli.url are set correctly.

Has anybody any idea where I have to start or how to solve this problem?

Regards
BeSt

Is this the only check this is failing or are there are other errors also displayed under Administration settings->Overview?

Also, what version?

Have you activated the Cloudflare proxy?

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