Staff accounts must have specific permissions enabled in order to use Super Address Labels.
Super Address Labels requires the following minimum permissions to be enabled on staff accounts:
IMPORTANT: It is not sufficient to have "Apps and Channels" permissions enabled only on Super Address Labels. The top level "Manage and install apps and channels" permission must also be checked.
Super Address Labels is an application for Shopify that enables merchants to print addresses and other data from their orders onto label sheet templates made by Avery, Dymo, and other manufacturers, using a laser/inkjet or direct thermal printer.