I need to change the phone number to verify the purchases and I’m not receiving the permission ask

Hi JulioSanta,

Thanks for coming to Apple Support Communities for help today.

Ask To Buy comes in the form of a notification and won't come to your phone number by SMS or iMessage. This article can explain the feature further: Approve what kids buy with Ask to Buy.

It sounds like the Family Organizer needs to grant you permission to use the feature. This portion of the article will help.

"How to choose another approver

The family organizer can give another parent or guardian in the group over the age of 18 permission to manage Ask to Buy requests. Only one adult needs to manage each purchase, and after the purchase is approved, it’s final. 

On your iPhone, iPad, or iPod touch

In iOS 16 or later:

1. Go to Settings.
2. Tap Family, then tap your family member's name.
3. Tap Parent/Guardian.
4. Tap Set as Parent/Guardian. 

In iOS 15 or earlier:

1. Go to Settings, then tap your name.
2. Tap Family Sharing, then tap your family member's name.
3. Tap Role.
4. Tap Parent/Guardian."

If that doesn't resolve the issue, let us know more details.

Have a fantastic day!