[Q] [Help] Notifcations for certain apps not working?

Hi all, is anyone else having issues with notifications from certain apps not showing up? For me it is Facebook's Pages Manager. I can not get notifications for this app to work at all. I've cleared the data, uninstalled and reinstalled, logged out on my old phone, uninstalled on my old phone, turned on "priority" notification mode...

Notifications for Facebook and Facebook Messenger work, although are somewhat slow. Is there some setting I've missed somewhere?

Thanks!