https://www.apple.com/legal/internet-services/itunes/us/terms.html
"All Family members must share the same Home Country."
Share purchases with others in your Family Sharing group
https://support.apple.com/guide/mac-help/share-purchases-with-your-family-mchlc2b37692/mac
"To share purchases, family members must be in the same iTunes Store country or region."
Contact Apple. Click here --> https://support.apple.com/choose-country-region Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.
or:
Contact Apple for support and service --> "See a list of Apple phone numbers around the world."
Click here --> https://support.apple.com/HT201232