Hello there!
Since about 2 months i can not receive invites or messages. The only pop-up notifications that are shown are system notifications. While I can see messages in the guide-menu after some time, invites are not shown at all. I have made several attempts at fixing the problem without any success:
-Changing the notification settings (for all notifications and messages specifically)
-Deleting my Profile and downloading it again
-Using a different account to receive notifications
-Hard reseting the console
-Separating the console from power
-Deleting the blu-ray persistent cache
-Performing a factory reset
Another problem that might be connected is that I can't unlock achievements in games that I play via family-sharing.
I'm curently playing on Xbox One X and using Xbox Live Gold via family-sharing.