The Family Share program doesn't allow the sharing of in-app purchases. For more information, contact Apple.

 

Therefore, to be able to share them, you must do the following in each of the devices with blocked access to the in-app purchases:

  1. Uninstall the app from the device.
  2. Exit the Apple account, tapping: Settings, in the device's menu > iTunes Store and App Store > Apple ID:... > Sign Out.
  3. Log onto the Apple account that made the in-app purchase: insert your Apple ID and Password > tap Sign In.
  4. Download the app again.
  5. Open the app and enter the in-app Settings (gear icon or "i" icon > tap the "Restore Purchases" button.
  6. There! The packs should now be unlocked.


Once the purchases have been unlocked repeat steps 2 and 3 to change the Apple ID back to the one held by the person who uses the device.