I solved my problem. I had to go to https://alexa.amazon.com/ (or, equivalently) https://alexa.amazon.com/spa/index.html#cards Access "Skills" on the left Search for TP-Link Kasa Disable this skill...

@Carl [Edit] I said: "EP10 units are still not working with Alexa, but are working in Kasa app" and provided details. I solved the issue (explanation below).

@Carl That's great. Now, which of the upmteen methods do we use to get things working? Do I need to factory reset all of my EP10's? 1 of them? Forget all in Alexa? etc -Adam

I know there is a pinned post to document complaints about Kasa plugs working with Alexa, and that people are posting to it with the latest problems, but I am going to squeak here also in case that...

Tried doing a soft reset on one of my EP10 units by holding power button for 5 seconds, and setting up again in with the Kasa app. No luck. Still works with Kasa app, but no love from Alexa. I also...

Looks like this is the general post to send complaints to TP Link.... but I'm unsure if the problem lies with TP Link or with Amazon. Same as other most recent posts. I have 4 EP10 plugs. All work...