Okay reviewing my groups as some mailboxes are not showing up in the side bar. At a guess it has to do with visibility setting.
The Above group’s inbox does not show in either sidebar or inbox drop down. ..
I have tried changing saving and refreshing each time different settings on this page.
I only get 4 inboxes showing in either place. This might be a big or need a setting change in the dashboard settings..
This one below does show.

