Using MS Graph to retrieve webinar registrations

Question

Hi,

We are trying retrieve the registrations from a Teams webinar.
following this API reference: https://learn.microsoft.com/en-us/graph/api/virtualeventwebinar-get?view=graph-rest-1.0&tabs=http it should be very straightforward.

I can retrieve the general webinar information with /solutions/virtualEvents/webinars/{webinarId}
Then moving to retrieving the registrations by adding /registrations like this /solutions/virtualEvents/webinars/{webinarId}/registrations

But it just won't retrieve anything, only 401 Unauthorized, but it doesn't make sense to me as the only required permissions are VirtualEvent.Read which are also the requirement for retrieving the general information.

Any one got this to work, tips or different calls to get to the webinar registrations? Thanks!