I confirmed the fare class requirement with another agent - this appears to be policy, so in my opinion, it MUST be clearly, and concisely spelled out on co.com.

The 3rd agent said co.com is not setup yet for SDC, but another agent said the reason why the option is not showing up for me, is there are no flights tomorrow with my fare class available, therefore there is nothing I can SDC into, and the option will not show.

Now I don't know what to believe.