The Kindle PID won't work at FictionWise. If you have a Windows PC, just install
MobiPocket Reader and use its PID.
The same mobidedrm.py script will work with FictionWise MOBIs, but you need to give it the PID you provided to FictionWise.
A single MOBI ebook can include 4 PIDs, so it is possible to read it on multiple devices without circumventing its DRM. However, all MobiPocket software development seems to have ceased - so there will never be an official MOBI reader for Android or any other modern phone O/S.