UPS Live Rates: Collection point not found.

Hello,
I am encountering an issue while requesting live shipping rates using the UPS Rating API (v2205).
The API response returns the following error:
“Collection point not found.”
I believe all address details are correct, so I need your assistance to understand what is causing this error.
Below are the full request details for your review:
API Endpoint Used
https://onlinetools.ups.com/api/rating/v2205/Shop?additionalinfo=
Request Headers

Authorization: Bearer
Content-Type: application/json
transId: e04cd29f0a8ffa3eaa4f997278a6601a
transactionSrc: Octolize Plugin

Request Body

{
    "RateRequest": {
        "PickupType": {
            "Code": "01"
        },
        "Shipment": {
            "Service": [],
            "ShipFrom": {
                "Address": {
                    "AddressLine1": "55 Boynton Road",
                    "City": "Holliston",
                    "CountryCode": "US",
                    "PostalCode": "01746",
                    "StateProvinceCode": "MA"
                }
            },
            "ShipTo": {
                "Address": {
                    "City": "Stafford Springs",
                    "CountryCode": "US",
                    "PostalCode": "06076",
                    "StateProvinceCode": "CT"
                }
            },
            "Shipper": {
                "Address": {
                    "AddressLine1": "55 Boynton Road",
                    "City": "Holliston",
                    "CountryCode": "US",
                    "PostalCode": "01746",
                    "StateProvinceCode": "MA"
                },
                "ShipperNumber": "02X252"
            },
            "RateInformation": [],
            "Package": [
                {
                    "Dimensions": {
                        "UnitOfMeasurement": {
                            "Code": "IN"
                        },
                        "Length": "26",
                        "Width": "7",
                        "Height": "7"
                    },
                    "PackageServiceOptions": {
                        "InsuredValue": {
                            "CurrencyCode": "USD",
                            "MonetaryValue": "709.2"
                        },
                        "DeclaredValue": {
                            "CurrencyCode": "USD",
                            "MonetaryValue": "709.2"
                        }
                    },
                    "PackageWeight": {
                        "UnitOfMeasurement": {
                            "Code": "LBS"
                        },
                        "Weight": "7.68"
                    },
                    "PackagingType": {
                        "Code": "02"
                    }
                }
            ],
            "ShipmentRatingOptions": {
                "NegotiatedRatesIndicator": "1"
            }
        }
    }
}

I Need Help With:

1. Why does the API return “Collection point not found” for this request?
2. Is there any additional field required when using PickupType Code = 01?
3. Is my ShipFrom address required to be validated or registered as a pickup location?
4. Does the Shipper Number 02X252 require any special access or configuration?
5. Could this error occur because no shipper services or service codes are passed in "Service":[]?

Kindly review and advise what changes are needed to resolve the error.

Thank you!