Hi UPS Team,

I am facing an inconsistency between the UPS Tracking API and the UPS public tracking website.

📌 Issue Summary

When calling the UPS Tracking API using a valid reference number, the API returns:

{
  "trackResponse": {
    "shipment": [
      {
        "inquiryNumber": "1Z*************",
        "warnings": [
          {
            "code": "TW0001",
            "message": "Tracking Information Not Found"
          }
        ]
      }
    ]
  }
}

However, searching for the same tracking number directly on the UPS website shows full tracking information, including delivery date, location, and proof of delivery photo.

🔍 Expected Behavior

The API should return the same shipment details as the UPS website, assuming the reference number is valid and tracking exists.

🚫 Actual Behavior

The API returns:

• code: TW0001
• message: "Tracking Information Not Found"

Even though:

• The package shows Delivered on the website
• All tracking events are visible on the website
• Proof-of-delivery photo is available on the website

📎 Screenshot From UPS Website

🧪 Steps to Reproduce

1. Call the API
   GET https://onlinetools.ups.com/api/track/v1/reference/details/1Z*************
2. Receive “Tracking Information Not Found”
3. Search the same number on
   https://www.ups.com/track
4. Website shows complete and correct tracking data

📝 Notes

• Tracking number masked for privacy: 1Z*************
• All personal delivery information hidden
• Behavior reproduced multiple times

❓ Question

Is the tracking API experiencing delay, missing data sync, or additional validation rules not documented?

Any guidance or clarification would be appreciated.

Thank you!