So... back to Tapatalk.
These notification things, seem to be called 'push' notifications.
They can apparently be affected if you're not subscribed to threads.
One solution can be, to clear tapatalk's cache and data, open the app, login (this step enables it to create a new token in your device) and
then restore (if you need to)
It's also been suggested that certain versions of Tapatalk, have programming bugs.
Can everyone having issues, please respond in this thread with their phone model,
and the Tapatalk version they're running?