My forum is able to send push notifs to all android phone users, but users receive the same only if they’ve Nokia branded android mobile. Even on desktop, I’m able to receive notifs, only when the forum is open in one of the tabs.
And all non-Nokia android users are able to receive other push notifs from Chrome (e.g. I’ve MI android phone and can receive Meta notifs without problem, but not my own forums).
Whoever can suggest what could go wrong, I can pay him 10 dollars. Just for guiding me in right direction (whether fault is fixed or not, is a separate thing).
Of course, I cannot pay to multiple people, but only the first/best/chosen answer.