On my eisy, Alexa routines work correctly. However and as @Geddy said, many times over the last several years on my eisy and previous ISY, Alexa stopped working. Fortunately, Alexa is not really important to my system.
Every time I can remember, it's been on Amazon's end. I always rebooted the UD device just because. That typically didn't work, so I waited a few weeks for it to come back up. Sometimes it did. If it didn't, I deleted the skill and reinstalled. That usually did the trick. I personally don't think Alexa is a priority for Amazon.