This error (DHL Validation Failed: ErrorCode: 420506Data: Postcode not found. Expected formats) from DHL typically occurs due to unaccepted characters or formatting issues in the postcode field of an order. To resolve this issue, please review the steps below:
Check for any unaccepted characters in the postcode
These may include special characters (e.g., hyphens, hidden spaces) or incorrect letter combinations.
For example, for Latvia, the postcode should be 1010 instead of LV1010.
Verify the correct postcode format
Use Google Search to confirm the correct postcode format for the destination.
Update the order with the corrected postcode format.
Save and attempt to generate the shipment again.
If the issue persists after correcting the postcode:
Please raise a new case online and reference the title of this article.
Be sure to include the order references that are affected.
By following these steps, you should be able to resolve the postcode validation error.