Correction to above statement. Three new devices did get picked up by Alexa despite the above message but I cannot get a fourth to show up in Alexa. Alexa is actually telling me the device in question is found more than once when I ask it to turn on/off yet the device does not show up in the actual Alexa app. I wonder if that is messing with the Skill somehow.
Take a look at your devices in Alexa (alexa.amazon.com) via your PC, not the Alexa mobile app. A while back I found a ton of devices that I removed via ST, but somehow it never got removed from Alexa. I had to manually delete all those old devices. After I did that I stopped getting those errors.
I’ve had issues like this as well and find the Alexa app to be extremely flakey. After you do the sync and don’t see the 4th device, try editing a group and see if it shows there as a possible device. Also, scroll through all devices in that list. I’m finding mine are often out of alphabetical order and some are plain hidden until I’m in a group edit menu. Super annoying.
Good luck and hope they do all appear eventually.
This morning, without me doing anything new or different I am able to save in the Alexa SmartApp.
Alexa still reporting no new devices found BUT this is a Harmony activity switch and it does show up in the Scenes section in the Alexa app and all is good. It had been a while since I added a Harmony activity/switch so I wasn’t paying attention. However, it’s confusing when Alexa discovery reports nothing found.