Amazon MCF USPS Tracking Now Supported on TikTok Orders via 4Seller ERP – Get Tracking Numbers in Just 2 Hours

As TikTok Shop continues to tighten its review of postage fraud, sellers are encountering a notable shift in fulfillment rules.
The platform has restricted merchants from uploading USPS tracking numbers via third-party self-fulfillment, while applying stricter identification to high-risk tracking numbers. Although TikTok Shop’s logistics team has coordinated with Amazon MCF, and the system now allows sellers to directly input Amazon-generated tracking numbers in the TikTok backend by selecting Amazon Shipping + Amazon MCF, the interface warning may still appear. However, this warning does not affect normal order submission.

That said, many sellers still encounter the following error when fulfilling TikTok orders using Amazon MCF (Multi-Channel Fulfillment):

“The tracking number of the shipping label you are using has been determined to be a high-risk fraudulent shipping label, and is not supported. Please consult your carrier.”
In practice, especially during periods of tight fulfillment deadlines and heightened platform risk control, this issue can become particularly disruptive. The sections below explain why this happens and how to resolve it effectively, based on system logic, root causes, and real industry scenarios.

I. Why Do Amazon MCF Tracking Numbers Trigger This Error?
Although TikTok has reopened support for submitting Amazon MCF tracking numbers, the system still performs enhanced validation on high-risk tracking data. The following scenarios are the most common triggers.




	

	
Amazon Changes the Carrier or Reprocesses the Shipment
	

Amazon MCF may regenerate a tracking number under several circumstances, including:


	
Carrier switching (e.g., from AMZL to USPS or UPS)
	
Label damage and relabeling
	
Package splitting or consolidation
	
Warehouse process adjustments
	
Automatic reshipments triggered by the system

For example, during Black Friday, a US-based seller used MCF to fulfill TikTok orders. Due to mid-route resorting, Amazon automatically issued a new USPS tracking number. However, because the TikTok order had already exceeded the 3-day submission window, the seller could not update the tracking number. As a result, the platform identified the order as having no valid logistics updates and flagged it as high risk.


	

	
Slow Tracking Number Generation
	

Amazon MCF only returns a tracking number after packing is completed, which can take 1–3 days or longer.

However, TikTok’s fulfillment rules require orders to display valid logistics activity within a short timeframe. If tracking data is delayed, the system may interpret the order as a potential false shipment, triggering the error.

This delay is one of the core reasons sellers encounter the issue.


	

	
USPS Tracking Numbers Fail TikTok’s Initial Validation
	

TikTok applies stricter validation rules to USPS tracking numbers. Certain USPS formats returned by Amazon MCF may be misclassified as high-risk during TikTok’s initial verification stage.

For sellers relying on Amazon MCF’s automatic carrier selection, this is a system-level conflict, not a merchant violation.

II. The Solution: Connecting Amazon MCF AFTN × TikTok Official API via 4Seller
To address common MCF tracking submission issues, 4Seller has completed an official technical integration with TikTok’s AFTN API, enabling Amazon MCF–generated AFTN numbers to be transmitted directly back to TikTok. This significantly accelerates access to the latest logistics updates from Amazon MCF.



Key Benefits:


	

	
Successful Submission of USPS Tracking Numbers
	

(Applicable to single-item orders only)

By directly connecting Amazon MCF with TikTok’s official AFTN interface, 4Seller eliminates concerns around USPS tracking recognition failures.


	

	
Significantly Faster Tracking Availability
	

Normally, Amazon MCF generates tracking numbers only after packing, which can take 1–3 days or more. With AFTN numbers transmitted via 4Seller, sellers can obtain a submittable tracking number within as fast as 2 hours, dramatically improving fulfillment speed and avoiding false shipment flags due to missing logistics data.


	

	
Reduced Risk from Tracking Number Changes
	

Before shipment leaves the warehouse, MCF orders may experience tracking number changes due to package splitting, consolidation, warehouse operations, carrier adjustments, or transport anomalies.

Once a TikTok order exceeds the 3-day modification window, sellers cannot update tracking numbers. This often results in orders being labeled as false shipments, leading to store penalties or fund freezes.

By using 4Seller ERP to transmit AFTN numbers, TikTok can continuously retrieve the latest logistics updates, regardless of how many times Amazon changes the underlying tracking number. This significantly reduces the risk of store suspension or penalties.

III. Real-World Case Study
A US-based accessories seller experienced this issue repeatedly during peak seasons while fulfilling TikTok orders via Amazon MCF. Several packages were relabeled mid-transit, prompting Amazon MCF to generate new tracking numbers.

Previously, once TikTok’s 3-day window had passed, tracking updates could not be modified. Orders were frequently flagged as false shipments, resulting in store point deductions and delayed payouts.

After switching to 4Seller, Amazon MCF–generated AFTN numbers were automatically transmitted to TikTok. The platform no longer depended on manual updates, and regardless of tracking number changes, TikTok could always retrieve the most recent logistics data via AFTN.

Conclusion
As TikTok continues to strengthen compliance enforcement, Amazon MCF remains a reliable fulfillment solution. However, due to complex logistics chains and uncontrollable carrier variables, it can still trigger platform risk controls.

By deeply integrating with TikTok’s official interfaces, 4Seller provides a more stable and compliant MCF × TikTok fulfillment solution, helping sellers avoid unnecessary penalties and operational risks during periods of rapid business growth.