p.s. There are LOTS of apps that work with 2FA on Mastodon such as Raivo, Aegis and many others. (They are technically known as "TOTP apps" or "authenticators")
Maybe people can recommend good 2FA apps in the replies?
Mastodon is the best way to keep up with what's happening.
Follow anyone across the fediverse and see it all in chronological order. No algorithms, ads, or clickbait in sight.