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Generally speaking, the surest way to have users be redirected to the SSO when they go to your Canvas URL is to set your SSO authentication provider as the first authentication source listed under Admin > Authentication (i.e. the "Position" setting should be "1").
Generally speaking, the surest way to have users be redirected to the SSO when they go to your Canvas URL is to set your SSO authentication provider as the first authentication source listed under Admin > Authentication (i.e. the "Position" setting should be "1").