On iOS, the Companion should have settings in the "Settings" app (they might be in the "Notifications" sub-group in that app). Make sure you have this toggled on.
However, because of RS Mobile (which will have the functionality of everything in the Companion app), support for the Companion app was discontinued. If something happened that broke the notifications, it will not have been fixed and will not be fixed before RS Mobile is released.
with RS Mobile release pending confirmation, i wouldn't think push notifications feature will be worked on but if it's a 2 standalone app , i would want the push notifications feature for Companion be worked on.The best Teacher is