I have found an issue with permissions in Power BI Report Server associated with nested AD groups. We use Active Directory (on premise) groups to control permissions in PBIRS. I have found that if members are listed directly in the group then the BI reports run as expected, e.g., Group A > member Person A, Preson B, etc. If members are listed implicltly as part of a nested group the BI reports do not run, e.g., Group A > member Group B > member Person A, Person B, etc. All permissions on folders, etc. work fine with members in nested groups, but when the user tries to run a Power BI report the loading icon appears and then there is no report. I would not have expected this behavior as this is a MS product so I am guessing this is a bug of somekind.
I am running PBIRS v126.96.36.1997.
I worked with support on this issue and it turns out the issue was due to a 1-way trust between the domains. I was using a service account in domain A to run the Power BI Report Server in domain B. Once I switch to using a service account in the same domain as PBIRS the issue went away.