Following these instructions: https://developers.google.com/apps-marketplace/preparing
I am unable to deploy an in-house Contextual Gadget to a Google Apps Domain. I have filled in the COB details correctly, but validation forces me to have: "At least one of Universal Navigation or Drive Extension needs to be enabled" Neither of which are relevant. Choosing "Universal Navigation" allows me to proceed, however the extension is installed as a "Universal Navigation" link, not as a Contextual Gadget.