Checking if row level security works

Hi Power Bi Community

I have added this row level security: 
[Afdelingschef email] = userprincipalname()

It works exactly as it should which is great, but I cannot see which user can see what data.
When I type a mail addrese into the desktop version it shows all the data no matter what e-mail it is.
When I type the e-mail into the service I see no data for some reason.
I use this guide to check if the user has acces: https://docs.microsoft.com/en-us/power-bi/enterprise/service-admin-rls

All help is appreciated.