Smart home devices stopped issuing notifications

We've got 'smart' devices in our home (Ring doorbell and cameras, Schlage lock) that have just randomly stopped sending out notifications. We still get notices from myQ but the other devices just stopped notifying on my and my wife's phones. Both are iPhone 13 Pro Max running iOS 18.3.1. Bounced the WiFi router, restarted the phones -- no joy. The notification settings are on for the devices.