Haproxy config does not work

Hi i have trying to do this configuration work but it doesn’t, i don’t why, i am noob with haproxy i just followed a youtube tutorial: HAProxy Crash Course (TLS 1.3, HTTPS, HTTP/2 and more) - YouTube

this is the haproxy config:

and this what i get when i try to enter /auth path

Check whether the destination server is actually reachable and enable logging during the failing request: