I'm also struggling with this issue, but at a different level:
I know that when an LTI Advantage app makes a service call (e.g., to post a score in Canvas), the flow starts with making an access token request from
https://<canvas-install-url>/login/oauth2/auth
However, for multi-tiered accounts (e.g., a university system master account that encompasses several institutional accounts) it's not always easy to know which <canvas-install-url> to use. So my question boils down to:
Will using the URL https://canvas.instructure.com/login/oauth2/auth to request an access token always work for Canvas cloud accounts?
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