Cloudflare tunnel error 1000

Hello,
I am trying to set up a Unifi controller on our own server. The controller is reachable through the IP of his server and port 443. Now I want to make this public using a Cloudflare tunnel. Setting up the tunnel is successful but when I try to go to my domain name I keep getting the error 1000, DNS points to prohibited IP. When I go into my DNS settings, I only see the CNAME record that was created during the creation of my tunnel. This points to my tunnel ID. Does anyone have an idea how I can solve this? Thanks in advance for your help!
Kind regards

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