Cannot Reset Screentime Passcode

I’m trying to erase an old phone so I can sell it. After selecting Reset and Erase, the phone asked me for my screentime passcode, which I did not know. I went to screentime in settings and reset my password. All seemed to go well. When I went back to reset and erase, the phone told me I entered 5he wrong screentime passcode. Hmm, I just changed. But fine, I went back to screentime settings and tried to change it again. Now it just tells me I have a failed logon attempt after clicking I Forgot My Passcode and entering my Apple ID. Help. I’m in a screentime passcode loop and can’t erase my phone.