Click & Drop IOSS requirements have changed - 15th Oct 2021
Customs Declaration Category is now mandatory:
You will not be able to generate Royal Mail labels on Click and Drop without setting a default value, to do that:
Go to Settings in Click and Drop, and then Default customs information.
On the left, ensure Apply the following default package contents to international orders is ticked
Select the appropriate option from the Customs Declaration Category and press Save.
You should now be able to upload your international details to Click & Drop.