FCM notifications are not always delivered to the browser
We've been debugging this issue with the whole team for 2 months already.
Some of our users don't receive ALL notifications delivered. Yes, they are sent properly (a successful response from Firebase)
Neither our service worker nor in-browser's onMessage (from '@firebase/messaging') "sees" it.
Has anybody had something similar?
Please tell me how you fixed it, if you did.
At this point I don't even know what to Google and how...