A Canvas Trust needs to be established between two different Canvas instances. An explanation of Trusts can be found here. The benefit of a Trusted Canvas Instance authentication provider enables the ability for a user to log in on the Canvas instance they are provisioned on and be redirected back to the other trusted Canvas instance where the course is located. This is great for self-enrollment and Catalog scenarios.
Configuring Trusted Canvas Instance in Canvas
1. Navigate to the Authentication section of your Canvas instance, located in the Admin Navigation menu
2. In the dropdown menu of Add an identity provider to this account: select Trusted Canvas Instance
This will only appear once a Trust is established
3. Select the trusted Canvas instance from the dropdown, click Save
4. Use the direct authentication provider URL to login with the trusted Canvas instance. The provider URL will be .../login/trust (ex: school2.instructure.com/login/trust)