Thanks Bob. Found a lower case that needed to be upper; my error. I made several different v1 calls and they still work, so I'll stick with that as well. Now to make use of the data in a program!
I finally have the HS-300 power strip nodes installed and working. Even though it was connected to my WiFi and could be controlled via the Alexa app, apparently it needs a stronger connection while the PG3 node install is made. I ended up relocating it nearer the wireless access point and the install completed without error. One thing to note, and YMMV, when it shows up in the admin console, it was way down off screen in my list of many devices because it installs with the label beginning with SmartStrip, not Kasa. I kept looking for the plug nodes under Kasa Controller, and they were not there. Maybe the name in the install script could be changed to group it with the main controller node?? Anyway, Jimbo, thanks for bearing with me through this process.