Alert notifications don't reach my phone

Push notifications are the last link of a chain — each link has to hold:

1. The rule fired at all? Check Settings → Alerts: the rule must be enabled, and remember Hold for delays the alert (default 60 s of the reading staying past the trip value) — a brief dip won't fire.
2. Is the van linked? Notifications travel through the Remote Dashboard. Settings → Remote Dashboard must show LINKED AND CONNECTED. LINKED (SWITCHED OFF) means the link is fine but its Activate remote dashboard switch is off — turn it back on (Remote Dashboard settings). A Home Assistant broker connected at the same time does not affect this; the two connections are independent.
3. Does the van have internet? The alert chip appearing locally but no notification arriving usually means the van's uplink is down.
4. Phone side — the app must be signed in to the same account the van is linked to, and the phone's notification permission for it must be allowed.
5. Already notified? Each alert notifies once, when it starts firing. It is not repeated while it keeps firing, and recovering sends nothing — so an alert you can see on the chip having sent no notification just now is normal if it was already firing.