Need help understanding relationships

Can someone explain how relationships are stored and why it might not even record?

To put it into context, I have a two way relationship between Users and Meetings.

Upon setting up the meeting by clicking a button, I would have to update the “New Meeting” with information like its Name, Location and users with logged in user, after creating the new meeting. However, when adding the next action to only update the New meeting with current user that is in a conversation with logged in user, and omitting the other information like names, it doesn’t update the relationship at all.

Why does this happen? Because from my understanding of it, one meeting should be linked to the different users, and after having set up the initial meeting details, Adalo should be able to handle just updating only the users involved in the meeting. Thanks in advance!