I forgot my restrictions password
how to reset restrictions password
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From the article below.
To change or turn off the passcode on your child's device, tap Settings > Screen Time > [your child's name]. Then tap Change Screen Time Passcode or Turn Off Screen Time Passcode, and authenticate the change with Face ID, Touch ID, or your device passcode.
If that doesn't work, You will need to restore the device to factory settings. Do not restore from a backup made when the Screen Time code was active.