When our end-users click Add to Backpack, Moodle immediatly returns an Error (invalid request).
The Badgr backpack integration configuration is correct (site-level and user-level) as both report a successful connection to the Badgr (US) site. External badges that were previously hosted on Badgr ARE also visible as 'external badges' on Moodle user profiles.
What are the minimun requirements for a Moodle badge prior to baking and exporting to Badgr? How do we begin to problem-solve this issue?