This worked to fix that problem for me during the Alexa Echo Plus setup.
1. I unregistered the Echo Plus by going to
https://alexa.amazon.com/spa/index.html#cards and clicking: SettingsDevices (the name of my Echo Plus with the word “Offline” under it) About Device is registered to: (my name). To the side, there is a box to click to “Deregister.”
2. Next, I changed what my laptop computer allows my wi-fi to do by temporarily changing the laptop settings so it would “search for other devices” by going to: SettingsNetworkConnectionsWi-Fi (the name of my wi-fi network)Find Devices and Content. At that location, there was a switch on/off for “Find PCs, devices and content on this network and automatically connect to devices like printers and TVs. Turn this off for public networks to help keep your stuff safe.” I turned this switch “On.”
3. Returned to the Alexa website,
https://alexa.amazon.com/spa/index.html#cards and registered the device by clicking: Settings Devices Set Up New Device. I selected a USA time zone and matching zip code, since I am living abroad in Russia. This time I was able to go through the entire registration process with “Continue” buttons and am happy to say it works.
I hope this helps others. It took about an hour of trying different online suggestions, then poking and guessing, before I decided to try this “Find Devices” toggle. I feel awesome that I got it to work and hope I can help others by posting this.