Entitlements showing mapped in dashboard, but during purchase they are showing as empty

my dashboard shows that product is linked to an entitlement
but when user goes to purchase a subscription in the API call Purchases.getCustomerInfo()
fetches no entitlements corresponding to that order (check below json)

"entitlements": {
"active": {},
"verification": "NOT_REQUESTED",
"all": {}
}

Can anyone help me out in this?