So I'm not getting any push notifications from apps. Facebook, Instagram both have all the options checked but never get any icon in the notification bar or sounds. Google+ is super slow to show them if any at times. But Gmail works fine.
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I was having the same problem... I have a Samsung Note 8. I realized that the apps that were not sending notifications had been put to sleep by the Optimize setting.... settings > Device Maintenance > Battery > Always Sleeping Apps.
Hope that helps