When the favorite list of #2FA providers (https://twofactorauth.org/) does not want to include self-hosted service, because <no idea>.
So I've created a PR to be at least honest about that and prevent waste of contributor's time:
https://github.com/2factorauth/twofactorauth/pull/3550
(obviously, I would much more like it, if they just include services like #Mastodon and #Nextcloud etc.)
Also, notice https://www.dongleauth.info/ does it better: they already list #Mastodon (but not #Nextcloud: https://github.com/Nitrokey/dongleauth/pull/167)
/cc @Gargron