I got a notification in MI community app with screenshots that stated that I will get PRO subscription in Hungama.com app and my phone is an eligible one. I followed the steps and did not get any PRO account. I followed every step and logged in using my Mi.com account which I had used to buy my MI Max (Prime).
I even got an email from hungama.com after registration:
You have successfully signed in with you’re Mi credentials on Hungama.com