Using Authorization Code Grant with all fields filled correctly I am able to walk through getting the access token and if i move the page from the ReadyAPI browser out of the way I can see that the authorization code is received and the check mark is there. At this point I have no contol over the Get Access Token screen as the browser seems to be modal and if I close the browser then the Access Token information is lost. Red Exclamation Triangle and text Retrieval cancelled.
I have determined that we are using the 3-legged approach in OAuth2. Trying to locate best method for this approach in SoapUI Pro now. Will update if I find it. In case others find that this is why they receive the same message.