Thanks Chris. By changing the Print Grade from Quiz to Couse as you suggested, it works! Now back to my one of my original problems (though not as pressing)....
When we first click on the "Get your certificate" button, we are taken to a new window with the following error message: "Coding error detected, it must be fixed by a programmer: invalid context specficied".
I think that this is an issue that others have posted about so I will do a little more digging. My current work around on this is to close the new window that the message appears in and re-click the "Get your Certificate" button at which time we now have success!