Adding someone to Family Share

Is that other individual already in a Family Sharing plan?

hshung wrote:

She has her own Apple ID, but uses my AppleID for iTunes and payments. Is that the problem?

Yes, she should solely be using her ID alone, not yours.

Sounds like the Family member is already using a payment method that is being used by another family member. i.e She seems to already be be part of a Family Group maybe is even the Organizer of that group and it has an additional account in it using that payment method with Ask to Buy.

In other words she cannot be part of 2 family groups at the same time.

Again no. she should not be using your Apple ID.

Using your Apple ID entirely defeats Family sharing. As your Apple ID already has access to all its purchases and content.

She should be usign her own Apple ID for iTunes and App Store purchases. There is no reason to use yours on her devices.

It will still charge you. That's how Family Sharing works. The Organizer is charged for all purchases even though family members use their own Apple ID.

See: link-> Set up Family Sharing - Apple Support

Family Sharing makes it easy for up to six family

members to share App Store purchases, Apple subscriptions, an iCloud

storage plan, and more—all without sharing an Apple ID. You can set up

an Apple ID for kids, set permissions remotely with Screen Time, and

approve spending and downloads from a parent's device with Ask to Buy.

You can also set up Apple Cash for a child or teen, or set them up with

an Apple Watch. Learn more about what you can do with Family Sharing. 

Start a family group

One adult in the family—the family organizer—can set

up Family Sharing for the group from their iPhone, iPad, iPod touch, or

Mac. If you turn on purchase sharing, you'll be asked to confirm that

you agree to pay for purchases initiated by the family members you

invite and that you have a valid payment method on file. Valid payment methods for setting up Family Sharing include credit cards and debit cards.*

You're most welcome.

You're welcome.