How to set up the access teams functionality?

I am not able to get the (automatically created) Access Teams functionality up and running in both Power apps and Dynamics. I hope someone can help me :-)

What I tried:

• Set up a test entity  (with User/Team ownership) in a brand new D365 test environment
• Check "Auto create Access teams" in the entity settings
• Create an Access Team Template for the Test entity; all privileges checked
• Create a Sub Grid in the main form (classic interface) with (not related entity) - "User" Entity - "Associated Record Team Members" - Team template Test

What I expected (after publishing) was a sub grid where I can add Access Team members for a specific record. However, I got a grid with all users of the tenant :-( . No buttons for adding team members to the access team or any other team specific functionality.

Does anyone have a solution for me? Would be greatly appreciated :-)

Thanks,

Elowy.