Steps to Reproduce:
Use the app, receive a message on talk page. Tried with wiki.pt.
A notification is fired at the cell phone for seconds (I could momentaniously see it), but then when looking for it in the app, it's nowhere to be seen.
Also: the notifications list is well hidden inside a context menu only visible at the initial screen.
Also: when trying to open a notification from there, it constantly threw an error. The information that appeared was that it was a "network error", which is absurd, since it was working normally otherwise.
Conclusion: Using the app is like being inside a bubble, without contacts with the exterior. It's no wonder there's so much people complaining here that using the app caused their Wikipedia account to be blocked, for reasons they don't understand.
Notifications should be very visible and very intrusive to editors using the app.