I am setting up an private app related to custom shipping. And always get null value on email of destination object. Even try with logged customer, email value always be a null. https://prnt.sc/uniuw8
https://shopify.dev/docs/admin-api/rest/reference/shipping-and-fulfillment/carrierservice i see a email field but never get value on it.
is there any restrictrion on this API?