Hi, new to the attempt at Row level security so I'll be the first to admit that I've got something setup wrong but here is what I'm seeing so far. I have created the Role in the desktop mode, and...
I tried to share dashboard (RLS enabled) to internal user and it worked properly, the shared user can only see the filtered data.
You should not share dashboard (RLS enabled) to external user, since you cannot add external user to any role in Security.
Please try to validate the role within the Power BI service according to this document.
Best Regards,
Herbert