Troubleshooting UPS Error Messages



UPS label service error: Severity: Hard, code: 120100: detail: Missing or invalid shipper number

You may have received this error for a number of reasons.

The most common is incorrect UPS credentials being entered in Shippo. First, double-check your UPS credentials on the Carriers page in Shippo and make sure they're correct. Once they're correct that error will be resolved. Some fields cannot be edited, so you may need to set up a new UPS connection on the Carriers page by clicking on the Add Carrier Account button and entering the correct information again.

If you are certain your credentials are correct, then it's possible that your shipper number (Account Number) was not added to your profile.

To verify you have the correct information in your profile:

  1. Log in to (Be sure to use the same User ID and Password that is in your Shipping API)
  2. Select Account Summary from the My UPS tab rollover menu.
  3. Verify that your account is listed; if not, select the Add a UPS Account link
  4. Follow the instructions to add the account



UPS: UPS label service error: Severity: Hard, code: 120121: detail: The Shippers shipper number cannot be used for the shipment

This error is returned from UPS and indicates an issue with your UPS account and not with the information you're entering in Shippo. This can be related to your account being deactivated or blocked for some reason with UPS which prevents the purchase of labels for that UPS account. Please contact UPS to resolve:



The adapter rejected the commit because it was invalid

This indicates that you are trying to add a carrier to your Carriers Page using the same account number that has already been used for a previous carrier connection. Since a carrier has already been added with the same account number, it will not possible to add that same carrier account again.

If you need to make changes to the existing carrier connection, such as the meter numbers or production keys, please click on the Edit link next to that carrier on the Carriers Page. All information may be modified by clicking the respective boxes. The only exception is the account number field which cannot be changed.



UPS: RatedShipmentWarning: Your invoice may vary from the displayed reference rates

This is just a warning and not an error. If you have your account set up to be billed weekly or monthly based on the number of shipments you do (for example, if you ship more than a certain number of packages in a particular month) then your total bill for the month may be adjusted down - the rates you see in Shippo may not exactly match what you see from UPS.


Your registration unfortunately failed due to the following UPS error: Missing or invalid PostalCode in ShipperAccount.

The address you enter when you connect UPS in Shippo must exactly match your UPS account address. Try copying and pasting the information directly from your UPS account. We also recommend removing any dashes or hyphens in phone numbers, account numbers, and postal codes as that could help.


UPS Authentication: Invalid Authentication Information

This error comes directly from UPS when the account credentials that you've entered in Shippo are incorrect. Please double-check your UPS credentials on the Carriers page in Shippo and make sure they're correct. Once they're correct, that error will be resolved.



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