Family sharing

I have a new iPhone account and have invited my daughter on family sharing. But she cannot accept the invitation as she already belong to the family of my old iPhone account. I have tried to log into the old account so as to uninvite her but to log in I am supposed to put in a verification code which is sent to my old number which I do not have any more.

my old account is ***** and the verification code keeps going to ***** and I don’t have the phone with that number anymore

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