Migration Subscription API returns 500 error

We got Advanced Commerce API and the generic product identifiers approved. When I was try to migrate a sandbox subscription to ACA enabled subscription I hit an error

Request payload
(Hid some info but the requestReferenceId is the real)

{
    "descriptors": {
        "description": "Migrated",
        "displayName": "Migration"
    },
    "items": [
        {
            "sku": "product_1mo_999",
            "description": "description",
            "displayName": "Product"
        }
    ],
    "requestInfo": {
        "requestReferenceId": "3b0b8e67-d8a0-45f4-8f6d-06bffa9a2c08"
    },
    "storefront": "USA",
    "targetProductId": "com.company.generic.subscription",
    "taxCode": "C003-00-1"
}

Response

{
    "errorCode": 5000000,
    "errorMessage": "An unknown error occurred."
}
Migration Subscription API returns 500 error
 
 
Q