I have had this same problem for over a year now, they wouldn't work on my iPhone iPad android phones or tablets. It has nothing to do with resetting anything, clearing caches, reinstalling or restoring. There's nothing to do with in the notification settings or anything. There is an app that you have connected to your Facebook which has blocked your notifications.
I tried absolutely everything to find this and stumbled across it and was stoked when I got a notification after a year!
Head into your Facebook app and click on account settings, click on the apps button and hit the turn all platforms off. Close the app in your multitask by double clicking your home button and closing the app from there. Open it back up. Get someone send you a test and bam.... Notifications
I never thought I would see a Facebook notifications ever again! Head back into your settings and turn platforms back on. Your apps will be gone but I'm sure you can reconnect them when you use them again.
I hope this helps most people get there notifications back!!
I tried absolutely everything to find this and stumbled across it and was stoked when I got a notification after a year!
Head into your Facebook app and click on account settings, click on the apps button and hit the turn all platforms off. Close the app in your multitask by double clicking your home button and closing the app from there. Open it back up. Get someone send you a test and bam.... Notifications
I never thought I would see a Facebook notifications ever again! Head back into your settings and turn platforms back on. Your apps will be gone but I'm sure you can reconnect them when you use them again.I hope this helps most people get there notifications back!!