What is the name of the domain?
What is the issue you’re encountering
I used my prescribed email address as my username for a new Google account and also used my domain to set up a new email address as another new Google username. Then, my inbox stopped receiving any more email messages.
What steps have you taken to resolve the issue?
I asked Google for support and unsubscribed from my new Google account.
What are the steps to reproduce the issue?
Use prescribed domain email address as a new username for a new Google account. Then, also use domain to create a new email address as another new username for another new Google account.