I appreciate the guidance. I don't see any errors (tested with both error level high and low) when trying to pair and I re-tried with both the device "closed" in Indigo and with the Indigo UI closed (quit the UI app). My device is communicating with standard Indigo just fine both with regular controls and even geofence-triggered action groups. In case it matters, I'm using IS X 10.11.6 (El Cap).
Three things that you might try to help us narrow down where the issue is occurring:
1. Restart the plugin and look for errors or messages; specifically any issues regarding unable to update the IWS plugin
2. Go to http://[indigoip]:8176/ in a browser and see if "Android Client Helper Plugin" is shown at the bottom
3. Do you have any TiVo, Roku, iTunes, or Timer devices? If so, attempt to control them via the Devices list (those should go through the same communications mechanism as the pairing)
Double unrelated: the Note 8 is very nice (check out swappa for lightly used deals ). Apart from a 6-month affair with a Nexus 5, I've been an iOS/Mac OS guy for decades and have finally switched to Android/Windows (apart from my Indigo server) and don't see myself turning back. The Note's battery life is very impressive, though smaller than the S8. I use the S Pen far more frequently than I expected and the device is incredibly fast. (Bixby is kind of useless, though...)
I've always envied the pen, but never could decide if I would use it a lot or not. I may test the waters with the Pixelbook if I can sneak it past the financing committee. May Xmas! I've been a Nexus/Pixel customer the last few years and really happy with those, except the Pixel 2 XL isn't enough of an upgrade to have me spend the money. 2016 Pixel XL still screaming fast for me.