Device not showing in new App (Arlo Pro 2 and others)

Hi all, new problem has occurred for me. Arlo has ‘fixed’ its trigger from ST and IFTTT which is great. Now I can trigger a record from a ST sensor. But I read that it was a good idea to remove and re add the cameras to ST to start afresh. I tested with 1 camera and now it isn’t showing on the new app. It is in the IDE, and in the classic app. I am trying to stick to the new app as it is finally able to do what I want, if it worked. Any ideas?
I am getting a ‘network error’ when I try to add it