“Failed delivery attempt / Return to warehouse”Normalized: exception (Needs attention)UniUni (uniuni)

UniUni 'Failed delivery attempt / Return to warehouse': How to Trigger Re-Delivery.

The UniUni driver could not access your building, gated community, or business address and returned the parcel to the local UniUni depot pending address/buzzer verification.

What is happening in the supply chain

Crowdsourced last-mile drivers require working entry codes or unlocked lobbies. When a delivery attempt fails (often status codes 205, 207, or 212), the driver brings the parcel back to the local warehouse at the end of their shift.

92… USPS Awaiting Item Checker →
Verbatim carrier scan
“Failed delivery attempt / Return to warehouse”
Normalized API status
exception
Typical time to delivery
1–3 business days (re-delivery required)
Recommended recipient action
Contact UniUni support with your UUS… tracking number, apartment/unit number, and gate/buzzer code immediately so they schedule a second delivery attempt before the parcel is returned to sender.
Developer / WISMO action
lastscanned normalizes this event to status: 'exception'. Trigger an immediate SMS/email alert prompting the customer to confirm their buzzer code or delivery instructions.

How lastscanned normalizes this scan

Instead of maintaining brittle regexes for every carrier's raw scan phrasing across 125 carriers, query GET /v1/track/{number} or connect https://mcp.lastscanned.com.

Get an API keyUniUni API docs

Synchronous GET request

curl "https://api.lastscanned.com/v1/track/UUS5BM1269395824723" \
  -H "Authorization: Bearer lsk_live_YOUR_API_KEY"

Normalized JSON response

{
  "carrier": "uniuni",
  "trackingNumber": "UUS5BM1269395824723",
  "status": "exception",
  "statusDescription": "Failed delivery attempt / Return to warehouse",
  "events": [
    {
      "timestamp": "2026-10-26T14:22:00Z",
      "localTime": "2026-10-26T10:22:00",
      "status": "exception",
      "description": "Failed delivery attempt / Return to warehouse",
      "location": "CHICAGO, IL"
    }
  ]
}

Frequently asked questions

Does 'Return to warehouse' on UniUni mean my package is being sent back to China?
No. It means the driver brought the parcel back to the local city depot after a failed delivery attempt so it can be re-dispatched once your address or buzzer code is confirmed.
How many times will UniUni attempt delivery?
UniUni typically holds the parcel at the local warehouse for several days and re-attempts delivery once updated access instructions are provided.

Related regional last-mile carriers scans

View all 45 scan statuses →

All 125 supported carriers

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