Thanks Janet.
I was able to get it working by using Google Authenticator instead. There are completely different numbers showing from Authy when I check both apps at a given moment.
I am baffled though, because I use Authy for about 15 other sites, and I’ve never had trouble. Also, I did try using Wordfence for 2FA about a year ago, and had the exact same problem, so I don’t get it, you would think this must be something people have run into, no? Is there some weird thing about my Authy install on both my phones that makes it specifically just not work for Wordfence? I’d really prefer to use Authy rather than the Google one.