I forgot my screen time password what do I do?
What do I do if I forgot my screen time password to turn it off?
iPhone 8
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If you forget your 4 digit Screen Time Passcode
4 Digit Passcode is for Screen Time Restrictions
4/6 Digit Passcode is for iPhone lock screen
If you can't remember a restrictions passcode that you set on a previous version of iOS, or you forgot your Screen Time passcode, you need to erase your device, then set it up as a new device to remove the passcode.
Restoring your device from a backup won't remove your passcode.
https://support.apple.com/en-in/HT204396
Use Screen Time on your iPhone, iPad, or iPod touch - Apple Support