Samsung Galaxy S22+ notifications are delayed or missing

Delayed or missing notifications on the Galaxy S22+ are almost always a battery setting, and Samsung Members has a thread marked solved that says so. Samsung's optimization puts apps to sleep to save battery, which delays their alerts, so the fix is to open Settings, Apps, the three-dot menu, Special access, Optimize battery usage, switch to All apps and untick the apps whose alerts are late. In Settings, Battery and device care, Battery, Background usage limits, check that those apps are not in Sleeping or Deep sleeping apps, and take them out. In the app's own notification settings make sure Allow notifications is on. Do Not Disturb and a Focus mode silence alerts.

One owner found the cause was an old LTE SIM that did not work well with the phone, solved by replacing the SIM. Wi-Fi power saving can also delay push messages. If a messaging app alerts correctly on Wi-Fi but late on mobile data, the phone's data saver may be restricting background data for it, and the fix is in Settings, Connections, Data usage, Data saver, where you can allow the app. A VPN can also delay push messages, so test with it off. Check that each app's own notification category is on, since a messaging app may have several channels such as messages, calls and updates, and a channel switched off silences just that kind of alert even when the app seems allowed.