Serious defect in function SPUtility.GetPrincipalsInGroup

Hi,

today I think I found a serious issue in one of the built-in utility functions in SharePoint on-premises.

According to the docs, the SPUtility.GetPrincipalsInGroup function should return ALL members of a group. But this is not correct, it returns only members which are part of the same domain where the group itself is located.

Where can I report this defect so that it will be fixed?

Thanks and stay safe

Rainer