In case anyone else experiences what I just did; make sure you update your ports to use 445 instead of 139. The 7845/55 doesn't allow for 139 and nothing tells you that. This includes the files that are in your template pool if you are using this method as each template has the port in it as well.
I worked with 3 different tech people from Xerox, one who boasted a whopping 20 years of experience while telling me that template pools weren't meant to serve as a central repository for scan settings(!?!?!?!), and none of them could figure out our issue. We ultimately figured it out through trial and error.
Hope this saves others the hours of frustration it caused me.