In PWA, your users must allow the notifications in order to receive notifications. If they won't allow, they won't receive any kind of notifications and you will keep sitting and thinking that your firebase is not working.
We have already mentioned it many times that you should consider Official Android App but everytime you create a new discussion with same thing...
I have sent you all kinds of access, demos, etc., @Saurabh tried to connect with you but again, not even a single message was received as a response from your end. What are you even up to I don't understand...
If you're developing your own app with FCM integration, you should know what you're doing, as its your work, we cannot help you as we don't know what you've done in it.
If you don't want to use the app, it's your choice, no one can force you, but why your users are not receiving notifications, we have already explained it 100s of times to everyone and several times to you as well on this forum. Please do not start any new discussion again or you'll be banned.
Sorry if this feels harsh 🙏
