Unable to connect to reverse proxied solution


I am trying to connect from the NextCloud Android client (3.24.2) to NextCloud 25.0.4. The server is reverse proxied through CloudFlare (CF).

I can connect just fine using an internal address, by specifying the NextCloud port, but not via the CF routed endpoint on port 80, RP-ed to 8080. It just spins. I was able to do so prior to moving it to be reverse proxied.

Any pointers would be highly appreciated. TIA.