I ordered an Amazon Echo 2nd Gen and I set it up successfully. In the setup I see my Echo AND an Echo Dot (shows offline). The only thing I can think of is that I did order and received an Echo Dot (still in the box) which is a gift for my sister. Is this why it shows up in my list of Echo devices?
LOL! This happened to me and certainly many others who brought multiple Echos into their homes during the Holidays earmarked for others. Ironically, once the gift Echo departs your home it will STILL be shown on your account. As mentioned you'll have to deregister it. Here's how:
1. Login to your Amazon webpage (I recommend on a PC);
2. Go to "Accounts and Lists";
3. Under "Your Account" go to "Your Content and Devices" (sign in further as needed);
4. You'll arrive at the "Manage Your Content and Devices" page;
5. Of the three available tabs, "Your Content, "Your Devices," and "Settings" select "Your Devices";
6. Click on the device you want to deregister;
7. Click on the "Device Actions" drop-down menu show below and far left; and finally
8. Select "Deregister," and confirm. Done!