First you need to do this:
- Open the Alexa Amazon SmartApp under Automations/SmartApps in SmartThings Mobile app and turn off the option to allow Alexa to discover all SmartThings devices (allow Alexa to access all devices option as shown below). Then select all of the devices that are only in SmartThings that Alexa didn’t discover from other 3rd party apps. This is key to do first.
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Open https://alexa.amazon.com from a browser, not the Alexa App. If you are doing this on a mobile phone and Chrome for example, after you login, you need to change options to select Desktop site so it doesn’t redirect you to your Alexa App or login on a laptop/desktop to do this.
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Then forget all SmartThings Devices.
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Then you can run discovery in Alexa again and she will only bring in SmartThings devices you manually selected to be discovered in number one above.
Definitely don’t disable them. There is no reason to have duplicate devices in Alexa. This could also cause potential confusion for Alexa when SmartThings goes down and she is looking for devices and gets lost seeing multiple devices with the same name, offline or not. Removing them removes any negative scenario from potentially happening.
Whallah!