Selfhosted with docker, cannot authenticate

I am trying to self host with docker following these instructions. Everything works fine until I need to navigate to http://0.0.0.0:3000/auth/signup where I am getting the following error

{"success":false,"message":"Authentication failure. Missing access token","triggerOauth2SSOLoginAutomatically":false,"triggerSamlLoginAutomatically":false}

. Note, I am actually navigating http://192.168.66.15:3001/auth/signup since I had to one change some ports since port 3000 was already taken and I can access it from a different machine (on the same network though).

Any help is appreciated!