Notifications
How to enable Teams notifications
By default, Teams sends notifications only for mentions and replies.
In order to get them working for each message follow this procedure:
Desktop App
Go to Settings -> Notifications -> Teams and channels and make sure that All activity is selected
Mobile App
In this case you'll need to activate the notifications for each channel manually. To do that just tap on the bell on the top right side of the screen. Make sure it is not crossed out.
You should receive personal chats notifications by default, by in case you do not receive them, tap and hold on the chat and select Unmute chat