Many Android Accessibility Services dispatch click events to elements. On the main screen that shows all the chats, each element appears to have a touch handler, but not a click handler. This means that users of many accessibility services won't be able to successfully click into any chats.

Additionally, many icons don't have contentDescription set so screen reader users won't know what many of the buttons do.

Using: https://developer.android.com/training/accessibility/testing and testing your app with TalkBack and Switch Access should quickly demonstrate these issues.