Plex Media Server Remote Access Problem

I installed Plex Media Server on a Raspberry Pi 4 (latest version of Dietpi) and I also connected my local network to a subdomain using Cloudflare Zero Tunnel. However, I am having problems with remote access. In the panel, under the remote access menu, I see the warning “Not available outside your network”. When I click the “Try again” button, the warning goes away and the connection is established. However, within a few seconds the same error appears again.

When I checked my router, it seems that the port is automatically configured on the client.

Router logs:
Ports 32400 and 27943 are related to plex

How can I solve this?