Locked out of Screen Time on child's iPhone and can't change passcode

I just set up Screen Time on my son's Iphone 8. I set up a passcode and entered my apple ID and password when prompted as security in case I ever forgot the passcode. Well, I must not have entered the numbers I thought I did because I get an incorrect passcode message when I try to change the Screen Time settings. So I clicked on "forgot passcode" and entered my apple ID and apple ID password. But instead of letting me reset it, it keeps on counting the failed attempts and telling me I can't log in again for 60 minutes. How can I reset the passcode using the apple ID? That's why it's there as a backup feature, right??