Welcome to the Auth0 Community!
- First, To add a custom domain to your tenant, your tenant has to be on a higher tier than free. You can either do it during the trial period or on paid tiers. Our Documentation team prepared an extensive guide about adding a custom domain to a tenant with auth0 and self-managed certificates. I’m linking them below.
- Yes, you are right! Page templates are managed via Management API. There’s no HTML code editor in the Auth0 Dashboard, but you need to upload the code via request or by using a CLI
API managed-> https://auth0.com/docs/customize/login-pages/universal-login/customize-templates#page-templates-api
By using CLI → https://auth0.com/docs/customize/login-pages/universal-login/customize-templates#using-the-auth0-cli-
I hope this will help you manage your Universal Login Page!
Thanks
Dawid