It’s well known that Touch ID fails when either the home button or your thumb/finger is wet. I just experienced access failure due to exactly that issue. Standing outside in the rain, I’m unable to dry it off, so currently the only way for me to gai access is to logout and use the email magic link.
It’s almost funny but definitely annoying.
A redundant password/PIN fallback is becoming more and more apparent that it’s just a necessity. By that I mean it’s necessary for an option to enable it. If the option is there and the user aware of its presence but chooses not to enable it, it’s user error for cases like this. Otherwise by not providing the option it’s just bad user experience when this happens.