How can I delete the settings and apps of the new iphone of my daughter? If I don't know the code 'toegangscode voor schermtijd'?

How can the 'toegangscode voor schermtijd' on a new iphone be changed? I don't know the

code. It is not the one I choose for screentime for the kids. And it is not the code of my daughter her phone. I cannot reset the phone now. (Try to get my daughters new iphone prepared

with all her old apps and settings. Its a mess and not working at all). It is with 'Wis deze phone'/ Cancel this phone I think translated in English (of Dutch)

This is necessary to clean the phone again to install the backup in icloud of the old i-phone on the new i-phone (The possibility with the 'directly access' at the beginning didn't work also. How do I fix this? So she can use my old Iphone 13 well. Thanks for your help, Marlouke