This is what happens when governments rely on a private corporate service for public announcements
Every government should just adopt a fediverse instance of some sort, maintain it and push that to everyone to use as a public announcement service. That way it would not be controlled, manipulated, lost or disconnected if they had full control over it all the time.
ignoring for a second you can turn off push notifications so that's a stupid contact method in the first place they also just linked to a 3rd party site instead of sending info directly over the system.
In Switzerland there is an app called Alert Swiss which gets published by the government. They use it for critical alerts and you can also use it to see open warnings and where in the country there might be stuff happening.
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