This error occurs when UPS cannot generate a label because the merchant's return address is missing a valid state or province code.
Error message
"Missing or invalid ship from state province code"
What this means
UPS requires a valid state or province code for the merchant return address. This commonly affects countries where state or province information is mandatory, such as the US and Canada.
How to fix it
Go to Settings → Company Details in the Swap portal.
Update the merchant return address.
Add a valid state or province code.
Save the changes.
Regenerate the label.
If the issue continues
Contact support with the RMA ID and a screenshot of the error.