The notification will come in Lock Screen.
I have one iPhone 11pro that has not been used for some time (at least no phone number) which I want to trade in. Had the same issue signing off AppleID. It says stolen device protection is on and needs 1 hour delay and I will get notification when it is done. But never got notification after 2 hours. Going back to the same cycle, waited till second morning, still no notification and not allowed me to change/sign out. It started 1 hour delay again.
I then tested on my iphone13 pro that I am actively using. I turned the Stolen Device Protection from “away from home” to “always” and then wanted to change back. It said I need to wait for 1 hour. After 1 hour, I got notification on the Lock Screen and saying I can make change now. Then I can turn off Stolen Device protection. So now I knew where to look for notification. The notification on the Lock Screen says
“Time sensitive, Security Delay Ended. You can continue with Settings. After 1 hour, a new security delay will be required to make changes”
I went back to my iPhone 11 Pro, make sure the location service is on, find my iPhone is on, and location service is active for finding my iPhone. Then try to turn it off, it asked passcode in FaceID and passcode, then I uncheck the “stolen device protection”. It scanned my face and then started 1 hour delay. This time, after 1 hour, I see the notification on the Lock Screen and was able to go into Settings->FaceID and Passcode->Stolen device protection, and turn it off (still it scanned my face one more time). I don’t know why it did not allow me to do for first 3 times. Maybe because my iPhone 11pro was not active for sometime and it says not in a familiar place even though I was at home. The overnight one could be missed because it only unlocked me for 1 hour but I did not know. So you can not wait for too long or too short. You must act within 1-2 hours if you see the notification at all. Yes. It is absolutely ridiculous.
