Look at this generic answer they sent me.
Thank you kindly for taking the time to reach out to us today. I hope that the day finds you well! •ᴗ•
The development team and our partners have been able to address a known issue for Playstation users who experienced problems with their active Diablo IV license. Invalid License Issues on PlayStation Consoles - #1533 by PezRadar
For Xbox users, this error typically occurs due to using Game Share. For information on how to use Game Share to do couch co-op, see this post. Game sharing during Early Access couch co-op on console
If neither situation applies to you, you will receive this error when no license in found on your account. If you play on Windows, you should:
Confirm that you are logged into the correct Battle.net account.
Your Games & Subscriptions page will display your “Diablo IV” license.
Your Transaction History may also provide you with more information in case of a payment issue.
If you play on console, you should contact your console’s manufacturer for more assistance (Sony or Microsoft) as we cannot access your console’s purchase history.
If you continue to have trouble please submit a bug report. Blizzard Support - Reporting a Bug
Thanks again for your time and giving me the opportunity to address your issue Mario! Have a great day!