Error reverse proxy Letsencrypt/Swag

I am using the reverse proxy of your letsencrypt / swag container. I have a problem with Gotify, the gotify.subdomain.conf file is the standard one, I haven’t changed it (not even a line).
I access the gotify page, but when I try to login it always gives me the “login failed” error, if I try locally without the proxy I have no login problem.

Do you have any ideas?

@zedred is this still the problem ?
I’ve had the same issue but when I refresh the page it allowed me to login.

Only thing I’m currently stuck at, is that remote connecting for Gotify messages gives me an error.