iOS push notifications are currently intermittently working for most users. We are working with Apple and Firebase at the highest levels to resolve the situation as quickly as possible. Please monitor https://github.com/home-assistant/iOS/issues/850
for more granular updates.
We do not have a estimated time to service restoration. It is very likely that service will get worse before it begins to recover.
You may be able to temporarily recover push notifications by going into the app's notification settings screen and tapping Reset button below the Push ID.
Please note: This only affects Home Assistant Companion for iOS, not Android or any third party mobile apps.