In this video, we enable a custom domain for Azure AD B2C end-to-end.
00:00 Problem statement
01:31 Azure AD B2C Tenant creation
02:31 App registration
03:45 User flow creation
04:52 Testing SignUp/SignIn user flow
05:44 Adding a custom domain
06:53 Azure AD DNS verification
08:15 Front Door creation
10:15 Front Door DNS verification and TLS
13:13 Testing custom domain user flow
14:23 Additional details and caveats
Here is the link to the official documentation: https://docs.microsoft.com/en-us/azure/active-directory-b2c/custom-domain