asbril

I believe that it is a known issue that likely will be resolved in a future update. I would not worry too much about it. When there are sgnificant updates there is always mention in this forum.

ZWave is not included. You must use either the Zooz 700 dongle or (preferably)  UD's  ZMatter board in USB enclosure.

I don't know much about Insteon but I have various ZWave 3-ways. It used to be that for ZWave 3-ways you needed the main switch and special auxiliary switches. Nowadays there several manufacturers that allow you to have a 3-way (or 4-way)  using a Zwave as main switch and using your existing Non-Zwave (plain old switch) as secondary. It may involve some wiring redirecting depending on where your Line, Load, Neutral are.
I had a situation where the Line and the Neutral of an existing 3-way were in different wall boxes, so it was bit complicated but it worked.
Of course you can also create a ISY program that works like a 3-way..... IF A is ON THEN B is ON;  IF B is ON THEN A is ON, and same for OFF.

no subscription needed

You can have 232 Zwave devices (and maybe even more). I have some 80 Zwave devices.

To open a ticket go to       https://www.universal-devices.com/my-tickets/ . This forum is mostly for user-to-user support, though it is often monitored by UD, but to open a ticket go the link. 

RESOLVED.........  In ISY Portal, Alexa was still set to old ISY instead of to IoP.