So here is one for you!
My partner and I both have the Home Assistant iOS app and we use push notifications for various things. They work perfectly.
We are running on 4G mobile broadband so no duckdns and no access from the outside (yet).
I can send a push notification to my partners phone when she is in another country and will get it yet I take my phone off the local WIFI and I don’t get anything.
How is that doing it? Is it a function of home assistant cloud? Other thing is why isn’t my phone working if it works on her one?