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USERPRINCIPALNAME is blank for External Customer
I have a report using RLS for my external customers. Sometimes we run into problems with the RLS and so we have a tab that simply displays their USERPRINCIPALNAME, as that can be useful in diagnosing...
Turns out the issue was I'd accidentally added RLS to the troubleshooting report by mistake. Removed that and re-published, and now everything is working. Thanks all.
- Blank USERPRINCIPALNAME() usually means the user isn’t properly authenticated.
- Make sure they’re accessing the report via Power BI Service, not an embedded or anonymous link.
- Confirm they’ve been added as a Guest user in Azure AD and accepted the invite.
- Try disabling RLS temporarily to see if it’s filtering them out.
- Use a raw measure like ShowUPN = USERPRINCIPALNAME() with no conditions.