every time I tried to create an app-specific password, I get this message (CONTINUE ON ONE OF YOUR DEVICES)

Someone in another post said to use a different browser (not Safari or whichever one you normally use). That worked for me.

Use a computer to generate the App specific passwords.

Don't use Safari or Chrome.

I got it to work using Firefox on my Mac.

It would not work when I tried on my iPad on any browser.