Out of curiosity - why would the domain be different? As per the spec, these endpoints are published by the Authorization server and provided as part of the openid_configuration document. And usually the authorization server will use (single) domain known to it when constructing openid_configuration document. For example, one.com.
This is the current condition, I know it is not ideal. I just want to know if it supports different domain before I will do extra work.
please I will be happy to get answer for that.