Facebook messenger notifications are late or nonexistent

[EllisKai]

Is it the same in your case?

The notifications are allowed

It's allowed to use background data even when data saver is on

Battery usage is unrestricted

I don't or rarely clear cache. Do I need to clear often? Is that a norm these days? 

Other settings, I didn't change. Do I have to make it appear on top of other apps? Is yours set to appear on top of other apps? 

Do you always receive Facebook messenger notifications on time? This has been an ongoing issue since the day I got this phone. 

[EllisKai]

Okay I've unmuted one of my groups in my older messenger account and received group messages notification as soon as the message came in. Perhaps it's really working fine now on my end. I hope yours will be sorted out too.