Create a developer key in Canvas:
- Set its redirect uri to https://courses.edx.org/canvas/oauth-complete
- Ensure it is enabled (ON)
Below is a screen capture of the Developer key page showing client_id In
[canvas_url]/accounts/[accountid]/developer_keys

Following in a screen capture of the Developer Key Settings page, where you need to set the
Redirect URIs value = https://courses.edx.org/canvas/oauth-complete (at
[canvas_url]/accounts/[accountid]/developer_keys#api_key_modal_opened
)