I've assigned a custom domain to the api and dashboard services. However, after assigning a custom URL openpanel.site.com the login no longer works. I have set the env variable NEXT_PUBLIC_DASHBOARD_URL to be my subdomain. When the login action happens the auth.signInEmail request is not being sent to the NEXT_PUBLIC_API_URL nor the NEXT_PUBLIC_DASHBOARD_URL variables which is causing the session cookie to not be set. Instead the auth is being sent to the auto-generated url from the deployment

You don't need to change the environment variables - simply set your custom domain in the networking tab for any service with a domain, then remove the automatically generated domain and redeploy all services if it hasn't done so for you already.

Thank you for the reply.

Right, that's what I did. I set the custom domain in the networking tab and they were auto populated to the env variables.

However the login request is still sent to the auto generated url even after deploy

Did you generate a domain both for the API and for the frontend? Is your custom domain the only domain set (there should be no railway domains there).