Turning off the lobby

Hi,

Does anyone know if it is possible in Teams to automatically admit participants who have dialled by phone in without placing them in a lobby? The documentation suggests it is and I think I have setup my policies appropriately but that greyed out option (screenshot) makes me think maybe it doesn't work yet... It is annoying as if the creator of the meeting doesn't join via Teams and joins by phone themselves (so imagine a meeting room with a spider phone) they need to enter a PIN etc to confirm they are the meeting organiser.

Many thanks!