Oauth chat bot app dissapears when clicked to open the chat window, then appears again


We have an oauth chat bot app for one of our clients (in account, not published). The app had been working fine but recently our client reported that the app is dissapearing when they click to open the chat on the left panel. Then appears again after few minutes. The chat can be openned as new window, but it’s impossible to open it by clicking. we can provide more information if needed.


Hi, can anyone help on that please