Room update notification

Hi,
Can someone please tell me when the callback set by 'Oculus.Platform.Rooms.SetUpdateNotificationCallback' is called? I am setting it at startup but it doesn't seem to be getting called when users join the room or the metadata gets set. When a user accepts one invitation to join a room, the owner does not receive a room update notification. Is there some other way for the owner to know that the friend they invited has joined the room? I am using Unity 2021.2.17f1 and the latest Oculus Integration SDK Version 46.0. I used to receive this notification before but it stopped working around the time when Meta transitioned from Facebook users to Meta users. I am using Meta Users who are friends on Facebook for this invite use case.