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I followed your directions and yes, indeed, I can control my TV via Alexa. I set up about 40 different Activities on the Harmony Hub. Linked Harmony to The Smartthings Hub. The activities are set up in Smartthings as "things" (deleted [Harmony Activity]). When linked to Amazon Echo, Alexa discovered the devices.The only issue I am having is that after nearly every voice command to Alexa, after the command is completed Alexa says the device does not support the command. But the command was executed flawlessly. It doesn't happen every time. Alexa will say "Okay" sometimes. But the error response happens way too often so I doubt I will use Alexa to change TV channels since she will annoy me with her erroneous response comment more times than not.I did email Amazon Echo support about the issue. Hopefully, Echo techs will resolve the glitch. Once the glitch is resolved, using Alexa to turn the TV (and AV system) on and off, change channels, turn on the blu-ray player, turn on Hulu, You Tube, Vudu (all on the Roku) will be a pleasure.
My biggest glitch is that every time Alexa switches channels, she turns off my TV. The TV is no where in the Harmony channel activities. Just the setbox which is set to never turn off. I can not figure out why she is turning off the TV after she changes channels. Anyone with advice would be much appreciated.