I am just telling you what I read. Something about the primary echo not finding the devices VS. the second one that was added.
I think others that were having problems also had Apple Airport Extreme as a router. That's what I am running.
TBH I am more than happy to use the existing app, if someone can figure out how to get it to work. I even setup another linksys router and connected hubitat and my echo's to that. Once again, no devices found.
