"No InPost Locker was found in the delivery address. Please check you have a valid Locker ID in the Address Line 2 field."

If you see the above error when trying to create an InPost label, it means that Shiptheory failed to find a valid InPost locker ID in the delivery address. You should make sure that the delivery address contains a locker ID in the format that Shiptheory expects. For more information, please refer to How Shiptheory Extracts InPost Locker IDs.