How to reset screen time passcode
How to reset screen time passcode if you’ve forgotten it
iPhone 12 Pro Max, iOS 14
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How you reset a Screen Time passcode depends upon the system version you are using:
Siince you say you are running iOS14 read this support article for instructions on what to do "If you forgot your Screen Time passcode". Click here --> https://support.apple.com/HT211021
If you still have issues resetting your Screen Time passcode, contact Apple Support.