It’s not full #passkey support replacing passcodes for login, but it looks like recent releases of Mastodon support #WebAuthn for #2FA. If you’re running a recent release of #iOS or #Android and are tired of entering #OneTimePasscodes on log in, check it out. It’s a bit more secure and un-phishable:

Once logged in to your account, you can add it via https://<your-instance-domain>/settings/two_factor_authentication_methods as “Add New Security Key”