UPS Error Message: The Mailer ID is required on SurePost shipments

When attempting to fulfill orders using UPS SurePost, you may encounter an error message stating: "The Mailer ID is required on SurePost shipments." This error indicates that while the shipping method is selected in ShipHero, the feature has not been fully activated on your UPS account backend.

This is a carrier-side configuration issue. ShipHero cannot bypass this requirement until your UPS account is authorized to transmit Mailer ID data.

Resolution Steps

Because this error stems from your contract settings with the carrier, it must be resolved directly through UPS:

1. Identify the UPS Account Number receiving the error.
2. Contact your UPS Account Representative or UPS technical support.
3. Request that the SurePost feature be activated for your account and that your Mailer ID be linked to your API credentials.
4. Once UPS confirms activation, attempt to generate the label again in ShipHero.