What does an "Invalid Customer Account Number" error mean for FedEx on Shopify?

This error usually means the FedEx account number entered is incorrect, inactive, or not authorized for third-party app integration. Verifying the account number matches exactly what FedEx provided and confirming the account is active and authorized typically resolves it.

If you want a reliable way to catch and correct this quickly on your Shopify store, PH Ship, Rate & Track for FedEx validates your FedEx account connection during setup, helping you spot account number issues before they affect checkout.