Open The Alexa app, go to smart home, and check the devices list to see what is listed there. You need to look at both groups and at individual devices.
bamarayne
(Jason "The Enabler" as deemed so by @Smart)
3
The duplicate devices wouldn’t Haken to be bulbs connected to a hue bridge or some other hub… Or Wi-Fi switches like wemo would they?
If you have Hue connected to ST, and direct Hue/Alexa integration they will show up twice in discovery. In ST Alexa app DO NOT allow give Alexa access. to any Hue devices. ( DO NOT click off the " give Alexa access to all devices and routines" ) .
If you go through Alexa devices they will show is Hue color, Lux, Downlight, etc and again as SmartThings dimmable
" I found more devices with that name " is also Alexa’s response any time she does not understand which device you said. It is annoying as all He77. In my house " she" constantly insists I have more than one kitchen.
How many Echoes you have is irrelevant. I have 9 ( not counting TVs and Kindles ) on 2 different Amazon accounts, they all work off the same DB of devices.
Unauthorizing them in ST will NOT remove them from Alexa. You need to go through them in Alexa app/website and delete each one individually. I just moved a few Hue bulbs, changed their names, ran discovery and they showed up as the new name and were still listed under their old name and group until I deleted them.
I may have fixed it. I went into the Alexa Web settings and 'forgot' everything then rediscovered. The same thing I had done on the app, but the Web page showed extra devices.
First, remove all smart device from Alexa and rename the location of your device. This is not the big issue. You can read about more smart devices and their connectivity and how to remove the echo register errors? Complete information on Setting up Smart Devices and Alexa for all beginners and solution seeker.