I don't know why you had to leave the family while a payment method was being set up.
This paragraph has reference to a wait period but you do not mention anything about changing Apple ID. Either that or you are in the countdown for the annual limit.
Legal - Apple Media Services - Apple
M. "Family Sharing Rules: You can only belong to one (1) Family at a time, and may join any Family no more than twice per year. You can change the Apple ID you associate with a Family no more than once every ninety (90) days. All Family members must share the same Home Country."
September 15, 2025Y
You are welcome to contact Apple about anything but realize they may just tell you that you have to wait it out.
Refer to this page for Apple Support features ➔ Contact - Official Apple Support
Select from the presented options until you find a solution for your issue, or see if there is a chat or phone call contact method offered lower on the page under “Get more help” (you sometimes have to narrow down the options multiple times before this is shown). If you do not see your issue, keep experimenting with any series of selections until you reach one that offers a chat session or a telephone call and get the representative to redirect you.
This support article has various country telephone numbers for contacting Apple for support and service ➔ Contact Apple Support - Apple Support For some countries look under “Other” listing at the end of the list. Not every country has telephone support, and phone numbers may only work when calling from the same country.
