First, I want to apologize for your question sitting in the community for so long without a response.
Second, it looks like you have stumped the Canvas Community. Were you able to find an answer to your question? I am going to go ahead and mark this question as answered because there hasn't been any more activity in a while so I assume that you have the information that you need. If you still have a question about this or if you have information that you would like to share with the community, by all means, please do come back and leave a comment.
We did find a resolution. In Canvas authentication, we gave Google position 1 and Canvas login position 2. See the image below.
I hope this helps!
I'm a new Canvas user whose school is looking at moving to Canvas, and this doesn't seem to help folks on free accounts. Actually, I'm testing as a student using a secondary email and as a teacher using a primary email. Accessing through a browser on a computer does seem to work for both student and teacher free accounts, but I can't get either iOS app to allow login or operate through Chrome on the iPad (even on the desktop site request).
I have a follow-up question. Since we went to Google oAuth, our administrators have been losing their admin permissions. We replace them, but shortly after they lose them again. Has this happened at your institution?