ParcelForce Authentication error occurs due to invalid/expired ParcelForce credentials on EasyPost / ParcelForce account.

You will need to reach out to [email protected] to obtain your production credentials for ParcelForce, then go to and add the updated information to your ParcelForce account.

When you go to your carrier account at - click on EDIT next to your ParcelForce account. You will see this:

In the center, under "Production Credentials" :

Try entering a number "1" and try buying your shipment again and see if it will work. If not, try inputting a number "2" instead, and click UPDATE to complete the EDIT.

For further assistance, contact Easypost at [email protected].

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