Kerberos with Report Server

I have the same error, but mine only happens when I set the authentication type to windows authentication as the user viewing the report and I use a PROD domain user to access the TEST domain Power BI Report Server, I believe it's a double hop issue.

Otherwise if I test with the TEST domain user, this same report works fine, I managed to configure SPN delegation following the instructions given here: https://docs.microsoft.com/en-us/power-bi/report-server/configure-kerberos-powerbi-reports

Trust between my domain is configured, my PROD domain user can access the PBIRS and view reports that have a forced credetial on the datasource as well as access the SSAS cube, both these servers are on the TEST domain.

If anyone has any idea for my double hop issue, I'm open for suggestions :)

Thanks in advance.

Mego