Hi Karl-
Unfortunately that model is not supported in the current version of our HP Scan and Capture app. Support for this is still a work in progress for us. I would offer the desktop solution for Scan to you, but you did mention you are running an RT device, which is ARM based, and we do not have desktop solution for RT/ARM devices.
You might have limited success with scanning out of the Embedded Web Server for your device using WebScan. I do understand this is a very limited solution, but could allow you to scan to your device:
http://h30434.www3.hp.com/t5/Scanning-Faxing-and-Copying/Webscan/m-p/2529347/highlight/true#M57952
I wish I could be the bearer of better news here...
Jeremy