We are developing a mobile app to streamline mobile acquired images for streamlined exchange and annotation within a study group (think exchanging handwritten solutions for problems math, chemistry, mech engineering...) with no asset upload/download. We test our mobile app against our own installation of a canvas instance at http://canvas.electricbook.net.
All testing between our mobile app and the test server works fine, and there are no problems we have in logging into our canvas server from a desktop app (or from our mobile app).
Since the installation of our LTI app modifies the teacher landing page, I wanted to see what things looked like if I used the 'official' canvas mobile app (for both teacher and student from Google Play), and simply logged into canvas.electricbook.net, but I can only get the error message I mentioned earlier.
So I am wondering if https is required, or if there is some server configuration setting we're missing, or if mobile apps work only with a specific type of deployment.