Hi @j_place ,
I agree that I could be mistaken, hence why I said “as far as I understand it” instead of “this is how it works”. I remembered running into something regarding this a few years ago. Things could have changed, I could have fixed a different issue inadvertently, or I could be mis-remembering. Given that and some of the mixed information in other posts, I figured it was worth checking if simply removing the $(domainname) reference would fix the issue or not, as I didn’t have this setup in a tenant to confirm one way or another myself and this seemed like the simplest way to test if that was the issue here or not since there wasn’t a clear answer.
Additionally, @Ankit_002 how are you running this test? I see that all of your test users have the same name. Your usernames in the screenshot are going from 10-15. 10, 11, and 12 all have 5 in the email, while 13, 14, and 15 all have 6 in the email. So it looks like it is doing some kind of incrementation, but you may be running into a race condition if you are trying to create all of these accounts with the same name/email at the same time. If this is the case, can you try creating one account at a time (with or without the $(domainname)) to see if the incrementation is working as expected?