Issue Custom tokens after social login with Spring authorisation server

Question

I am trying to implement spring authorization server with social login. I want a user to login using GitHub and after successful login, I want to issue a token to the user from my authorisation server I have tried using the example provided in the documentation, unfortunately the FederatedIdentityIdTokenCustomizer is not being invoked, this is configured as a bean as mentioned in the tutorial. I am not sure what I am missing here.

Can someone point me in the right direction?