Troubleshooting Return Label Generation Errors Due to Invalid ZIP Codes

When generating a return label in WeSupply, it’s important that the addresses provided are valid and correctly formatted. In some cases, even a small typo in the ZIP code can result in an error and prevent the label from being created.

Why This Matters

Return labels are generated based on shipping zones defined by the carrier. If an invalid ZIP code is entered for either the origin or the destination address, the carrier will not be able to match the route to a zone — resulting in an error and preventing label generation.

These types of issues can be confusing, especially when the system returns a vague error like:

“400 Bad Request: No domestic zone match found for origin zipcode XXXXX, destination zipcode YYYYY, and labelDate ZZZZZZZZ.”

This message indicates that the carrier could not find a valid route between the two ZIP codes provided.

How to Fix It

To resolve this issue, double-check the origin and destination addresses used when generating the return label. Pay close attention to the ZIP codes — even a single incorrect digit can cause the error.

Here’s how to troubleshoot and correct it:

1. Verify both addresses using a reliable tool such as Google Maps to confirm they are valid.
2. Update any incorrect ZIP codes in your system or order details.
3. Try generating the return label again.

For example, if the origin address is in Denver, Colorado, ensure that the ZIP code is 80218, not 89218 — which is not a valid code for that area and will trigger a zone mismatch error.

Once the correct ZIP code is entered, the return label should be generated successfully.

Additional Tip

Always encourage your team or customers to validate address information before submitting return requests. This simple step can prevent delays and avoid confusing error messages from the carrier’s API.