Mi a2 Lite Notification issue.

[TorplXe]

Hey! I bought the A2 lite a few months ago, it's my first Xiaomi product. (I'm pretty sure it's the global version, by what I can find online.) I'm really happy with the phone, but i do have one issue. Most apps don't get me notifcations, and when I open one app for something it does tell me my device isn't registered to GCM. I don't know how to fix this, but it's really annoying. Most apps don't give me notifications at all, but some notifications come through once I open the app. This is only for facebook, sometimes instagram. Is there any way to fix this? It's really annoying, since I miss out on all kind of things because of this :/ The notifications I do receive are also delayed quite a bit.
I have not installed any custom ROMs, since I don't know how. It's been like this once I got the phone..

 

[Conus]

Notifications are broken in Android 8 (Oreo), because Google has introduced an additional "notification layer" on top of all apps.
Go to Settings->All apps, search your app, click on it and configure "Notifications" and "Other permissions" to get notifications on lock screen.

https://www.google.com/search?q=oreo+notification+sound

 

[thisuseralreadyexist]

This Issue persist on Android 9.
I Tried everything that I can but nothing solved the problem. It's super annoying!

Sent from my Mi A2 Lite using Tapatalk