Some of my contacts have migrated to the new Google Chat which means now I need it installed. Some of my conversations were automatically migrated to Chat but some were not and others have trickled over slowly. I would like to uninstall Hangouts to not have double notifications but I can't quite get there because some group chats in Hangouts have not migrated to Chat so if I uninstall I will lose access to those chats.
I have this notification in Chat
You can only join chats and rooms that you were invited to.
At first I thought "duh, I can never join a chat I wasn't invited to. This isn't new, why are they telling me this?" But now I see that I can't actually create any new chats at all with existing contacts. There is a random assortment of one-on-one chats migrated, group chats (which appear in the one-on-one chats section of Chat) and group chats which migrated over as "Rooms" but no way to create a new one of any of these.
How can I have one messaging app (at least for my Google contacts) again?