Api error

i'm not able to test API. I'm using these datas
{
"origin_country_alpha2": "SG",
"origin_postal_code": "059405",
"destination_country_alpha2": "US",
"destination_postal_code": "10030",
"taxes_duties_paid_by": "Sender",
"is_insured": false,
"items": [
{
"actual_weight": 1.2,
"height": 10,
"width": 15,
"length": 20,
"category": "mobiles",
"declared_currency": "SGD",
"declared_customs_value": 100
}
]
}

and i have the this response

{"rates":[],"messages":["Validation Failure: ["Sorry, we can't estimate the taxes \u0026 duties for this country."]","Sorry, we couldn't find any shipping solutions based on the information provided."]}

on sandbox
and this one on prod
{"rates":[],"messages":["Sorry, we couldn't find any shipping solutions based on the information provided."]}

can you help me?