Hello @larryllix and @dbwarner5 and everone in this thread. Just wanted to say thanks for the help.
Dealing with Amazon support was insane. I had 12 agents ask me to do the same troubleshooting steps (12 times!) ie uninstall and reinstall the app, deactivate, reactivate the skill, disable, reenable the routines. create new motion sensors, create new routines, change the name of my echo devices, deregister, register etc. All but the last one agent dropped me without explanation.
Anyway, the last one finally escalated it (opened a ticket) and they are going to look at my account first - to see why these Routines (related to ISY) are not running despite the change of state in the device.
Thanks again