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