Writing this to see if anyone also had this issue, Yesterday I attempted to change some of my screentime settings but my pin wouldn't work. I tried everything because I only really use 2 different pins for the last 10 years and I was positive it was the same pin, but my iPhone and iPad both didn't accept it. I spent hours trying to extract it, even using https://www.iphonebackupextractor.com (which didn't work!) or manually trying to hack into my back ups to recover it. I then restored my iPad to an older back up but it still wouldn't work. I got all the way up to "wait 60 minutes" before guessing the new password after trying every combination I could think of, mistypes of my typical pin, 1234, etc. on both devices. Surprising, I woke up this morning to try again, and my iPhone was fixed - the pin was actually turned off (I could set a new one). I didn't change anything and it would appear this just happened overnight. The iPad is still broken though but I'm going to wait I guess in case it fixes itself. This appears to be a straight up bug which could have some consequences because not knowing this pin code could prevent some essential features, for example you can not wipe your iPhone. Does anyone have a similar experience or have heard of this?