I've been using MobiLinc Connect and Alexa successfully for sometime now. Great stuff.
1. I just upgraded my ISY from to 4.x to v.5.0.16 and everything including Alexa works just fine.
2. The issue I just ran into experimenting is that I changed the "Spoken Name" on one of my Insteon Bulbs and Alexa doesn't recognize it.
3.I have gone through the instructions pretty carefully, making sure I saved the programs after changing the spoken name and asking Alexa to discover devices. As part of my trouble shooting, I went to Amazon Alexa wesite and forgot all devices and let Alexa rediscover all of them again and it discovered the Insteon Bulb with the previous spoken name, not the new one.
4. It would appear that ISY is not updating MobiLinc connect?
5. BTW, I just added a new Insteon Motion Sensor II and associated variable with the word sensor in the name and Alexa picked up that variable, but not the new / updated spoken name.
Any ideas?