Are the keys not getting issued at all, or being issued but not valid? After we performed a major upgrade to our server OS early last month, there was a brief period when our installed copy of the Armadillo keygen script stopped issuing keys at all, but we got that back in action a couple weeks ago (we just needed to install an extra software library that wasn't included in the standard OS package).
That said, you may want to consider a different solution, as Software Passport/Armadillo has been abandonware for quite some time now; the vendor, Silicon Realms, stopped selling it as of January 1, 2013, stopped supporting it as of July 1st, 2014, and now appears to be out of business:
http://www.siliconrealms.com/
Furthermore, in researching this I found that hackers have discovered files locked with Software Passport/Armadillo are trivially easy to crack open, so by now using it is only inconveniencing legitimate users without offering an effective deterrent against theft/sharing/piracy anymore.