Why can’t I see my notifications again and after I’ve seen it the first time?

You can't see it again if you have cleared it or is more than a week old.

anna-kaye876 Said:

"Why can’t I see my notifications again after I have seen it the first time. iOS 16"

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About Lost Notifications:

Is this something you've only seen in iOS16? Notifications have always appeared and then disappear when you login with the passcode. So, maybe take a screenshot the next time they pop up: Take a Screenshot On your iPhone - Apple Support