Getting error when trying to publish my offer A user error has occurred.

[os.dex25]

Hello everyone,

I'm starting with eBay API on API Explorer, and trying a sample offer publish on Sandbox. However, I always get the following error response after calling publishOffer call:

{
  "errors": [
    {
      "errorId": 25002,
      "domain": "API_INVENTORY",
      "subdomain": "Selling",
      "category": "Request",
      "message": "A user error has occurred. System error. Unable to process your request. Please try again later."
    }
  ]
}

Here are my complete data I used so far.

Inventory Location:

{
  "phone": "+13028312792",
  "location": {
    "address": {
      "addressLine1": "2055 Hamilton Ave",
      "addressLine2": "Building 3",
      "city": "San Jose",
      "stateOrProvince": "CA",
      "postalCode": "95008",
      "country": "US"
    },
    "geoCoordinates": {
      "latitude": 33.089805,
      "longitude": -88.709822
    },
    "locationId": "2177BDC6C6492B28E06490E2BAC50B98"
  },
  "locationTypes": [
    "WAREHOUSE"
  ],
  "operatingHours": [
    {
      "intervals": [
        {
          "open": "08:00:00",
          "close": "23:00:00"
        }
      ],
      "dayOfWeekEnum": "MONDAY"
    }
  ],
  "timeZoneId": "America/Chicago",
  "merchantLocationKey": "loc1",
  "merchantLocationStatus": "ENABLED"
}

Fulfillment policy:

{
  "name": "fulfillment_policy",
  "description": "Initial Fulfillment Policy",
  "marketplaceId": "EBAY_US",
  "categoryTypes": [
    {
      "name": "ALL_EXCLUDING_MOTORS_VEHICLES",
      "default": false
    }
  ],
  "handlingTime": {
    "value": 1,
    "unit": "DAY"
  },
  "shipToLocations": {},
  "shippingOptions": [
    {
      "optionType": "DOMESTIC",
      "costType": "FLAT_RATE",
      "shippingServices": [
        {
          "sortOrder": 1,
          "shippingCarrierCode": "USPS",
          "shippingServiceCode": "USPSPriority",
          "shippingCost": {
            "value": "10.0",
            "currency": "USD"
          },
          "additionalShippingCost": {
            "value": "10.0",
            "currency": "USD"
          },
          "freeShipping": false,
          "buyerResponsibleForShipping": false,
          "buyerResponsibleForPickup": false
        }
      ],
      "shippingDiscountProfileId": "0",
      "shippingPromotionOffered": false
    }
  ],
  "globalShipping": false,
  "pickupDropOff": false,
  "freightShipping": false,
  "fulfillmentPolicyId": "6207768000"
}

Payment policy:

{
  "name": "payment_policy",
  "description": "Initial Payment Policy",
  "marketplaceId": "EBAY_US",
  "categoryTypes": [
    {
      "name": "ALL_EXCLUDING_MOTORS_VEHICLES",
      "default": false
    }
  ],
  "paymentMethods": [],
  "immediatePay": false,
  "paymentPolicyId": "6207766000"
}

Return policy:

{
  "name": "return_policy",
  "description": "Initial Return Policy",
  "marketplaceId": "EBAY_US",
  "categoryTypes": [
    {
      "name": "ALL_EXCLUDING_MOTORS_VEHICLES"
    }
  ],
  "returnsAccepted": false,
  "returnPolicyId": "6207767000"
}

Inventory Item:

{
  "sku": "ps5con",
  "locale": "en_US",
  "product": {
    "title": "play station 5 controller",
    "aspects": {
      "Brand": [
        "Sony"
      ],
      "Type": [
        "Controller"
      ]
    },
    "description": "This is a red Sony PlayStation 5 DualSense Wireless Controller. It is a wireless controller designed for use with the PlayStation 5 console.",
    "imageUrls": [
      "https://i.ebayimg.com/images/g/sUgAAOSw~SVnbxot/s-l1600.jpg"
    ]
  },
  "condition": "NEW",
  "packageWeightAndSize": {
    "dimensions": {
      "width": 15,
      "length": 10,
      "height": 5,
      "unit": "INCH"
    },
    "packageType": "LETTER",
    "weight": {
      "value": 1,
      "unit": "POUND"
    },
    "shippingIrregular": false
  },
  "availability": {
    "shipToLocationAvailability": {
      "quantity": 10,
      "allocationByFormat": {
        "auction": 0,
        "fixedPrice": 10
      }
    }
  }
}

Offer (sku, location name, and policy IDs are correct):

{
  "offerId": "9293376010",
  "sku": "ps5con",
  "marketplaceId": "EBAY_US",
  "format": "FIXED_PRICE",
  "availableQuantity": 10,
  "quantityLimitPerBuyer": 2,
  "pricingSummary": {
    "price": {
      "value": "100.0",
      "currency": "USD"
    }
  },
  "listingPolicies": {
    "paymentPolicyId": "6207766000",
    "returnPolicyId": "6207767000",
    "fulfillmentPolicyId": "6207768000",
    "eBayPlusIfEligible": false
  },
  "categoryId": "117042",
  "merchantLocationKey": "loc1",
  "tax": {
    "applyTax": false
  },
  "status": "UNPUBLISHED",
  "listingDuration": "GTC",
  "includeCatalogProductDetails": true,
  "hideBuyerDetails": false
}

Opted-in programs:

{
  "programs": [
    {
      "programType": "SELLING_POLICY_MANAGEMENT"
    }
  ]
}

Am I missing something?