Setting up Reverse Proxy with SWAG?

[beboprocky]

Example: https://shareme.domain.com

Setup (using *.domain.com as an example):
Docker Compose
frontend:
environment:
POCKETBASE_URL: https://shareme-pb.domain.com

I then go to shareme-pb.domain.com/_/
I create an admin account.
I create a user account.
I go to Settings > Application > and set the following:
Application name: shareme
Application url: https://shareme.domain.com (same url as above but without "-pb")

Both domains work. But I am unable to login or sign up for a new account on the front end. Clicking "Login" does nothing. Clicking "Sign Up" gives me a 500 error.

I'm a little confused on the setup at this point.. The documentation says to forward "/api and /_ to the PocketBase backend" and "the rest of the traffic including /_next to the frontend". I saw in a Reddit post this possible to do with using subdomains, but I'm not sure what subdomains should be pointed to which domains or IP addresses. I don't believe SWAG can forward paths, so subdomains might be my only route.

Also, would the backend in this case be "shareme-pb.domain.com" or would I need to forward api and /_ to something else?

Thank you for the help if at all possible. I'm a self-host hobbyist so a few concepts do go over my head. I was able to get it working locally without a reverse proxy and this seems to be exactly what I was looking for. I appreciate the hard work that's gone into this project. It was definitely needed in the self-hosting space.