MojoAuth Passkey Index 2026: 346 Registration Ceremonies, 3 Errors

Registration success rate by browser x OS x authenticator is the passkey number nobody publishes. We ran 346 real registration ceremonies across nine authenticator classes and every authenticatorSelection combination: 163 failed, and 153 of them returned one identical error string. Here is the first edition of the Index, the instrument, and the four reproducible surveys behind it.