The list of people you’ve connected with or invited through the GroupMe app.
I've tried all of that & it still doesn't work. Others are able to join & be added to the group. AND, these 3 are able to be added to another test grou that I created just to see if that's possible. And they were able to be added. So, the specific issue is the connection between these members and this GroupMe. Weird. But frustrating. Do I need to move the entire group to a new cloned groupme or different platform?