I'm new to Braintree. I am getting the error when doing the payment.

{
  "status": false,
  "message": "Payment method nonce does not belong to the subscription customer."

Method to produce error -

1. User A buy a subscription (getting success response)
2. Now, User B wants to buy add-ons for User A. (failed - getting an error message)

Can users buy add-ons for another user and how?