Can't log in if server is proxied through cloudflare

[wmd1942 3]

My emby server (a docker container) is accessed remotely through cloudflare tunnel to the port 8096 of server. There is no problem to log in from my laptop's web browser. When I tried to connect the server from android app, the log in screen will show up but I can't log in. It will always show "Sign In Error Invalid username or password. Please try again" even though the correct information was provided. The server log shows a single line: "Error Server: Access token is invalid or expired". Any help is appreciated.

[wmd1942 3]

Update:

Issue is resolved if port 443 is specified (instead of left empty)

[Luke 37067]

Thanks for following up.