ERROR: Authorization_RequestDenied - Insufficient privileges to complete the operation (Native App)

Hello,

I know this has been discussed before:

https://community.powerbi.com/t5/Developer/ERROR-Authorization-RequestDenied-Insufficient-privileges-to/m-p/85256#M3011

But the marked answer does not solve my problem. I am trying to follow this guide to create a native app API access client id to create a PowerShell script that can refresh my reports after an event.

I created a new account, gave that account Power BI Administrator role in Office 365 and Admin rights over a few group workspaces. What else can I do to ensure that this user has the correct admin rights to register an app on this site?: https://dev.powerbi.com/apps

Thanks in advance!

Bobby