ScreenTime
How do I figure out what Apple ID was used to create my Screen Time passcode
iPhone 13 Pro Max, iOS 15
Have you tried all the Apple IDs you have?
If using IOS 13.4 or later or Catalina 10.15.4 or later, see the Apple Support article(s) below. Link to contact Apple Support at the end of the article.
If necessary, you will need to restore the device to factory settings. Do not restore from a backup made when the Screen Time code was active.