Unable to read data from MS Grapgh API

I am trying to read data from the MS Graph API.

Latest test was to get a simple user list.
I used different app registrations with different settings.
In Radzen MS Graph as only data source and with Azure AD authentication.

All test had the same result:

Local start:
Login -> working
GetMe -> working (user already logged in on PC)
GetUsers -> no data

Web server:
Login -> working
GetMe -> no data
GetUsers -> no data

There are no errors. All API calls return status 200.

Can you check what’s the response?