Bubble App Connector - connection breaking down

I have two separate apps that I am trying to connect using the Bubble App Connector. I have got it to the point where I can log in to one app (app A) and with the click of a button it will log me in to and open up the menu page of the second app (app B). My issue is that as soon as I register a user in App B, which has its own sign up etc, then App A no longer logs in and open App Bs menu, but it just essentially refreshes the page I find myself back on App As menu. If I then go an delete the user from App B, I can then log back in and open up App Bs menu from the button push in App A.

If anyone can help I would appreciate it.