There are my scenes and the voice commands. They worked great until I noticed this morning when I say "Turn on basement 40% it tells me,

"I found more than one device with basement 40%...."

Again, this is new and I'm not sure how to fix it.

@andrew77 Have you happened to have updated to Alexa+? If so, tell it to revert. Alexa+ is causing issues with home automation systems (there have been other posts here about it).

Try deleting the "basement" (50515) scene from the UD Portal portal. It should remove it from the Alexa app, but might need to delete it in there too. Since it's a "scene" I'm not sure how it shows up on the app these days. Old posts suggested scenes aren't displayed in the Alexa app and since they got rid of the website access it's a little more difficult to clean up devices.

More than likely Amazon has updated Alexa just enough that when you have one device that is "basement" and another that is "basement forty percent" it could be considering if you set the "basement" to 40% that's the same device as the "basement forty percent". Does it work with other percent requests? Or is it ONLY the 40% trigger?

Do you have multiple devices in this scene or is this just controlling a single device to a set % of brightness? If it's just a single device then I wouldn't have scenes for set brightness and just tell Alexa to set it to that percent. I have a few dimmers exposed to Alexa and just say, "Alexa, set x-lamp/light to y%".