Is Keycloak built-in the Yubikey OTP as a valid authentication method?

Getting advice
1

I have to require the Yubikey every time the admin update an User in Keycloak. But I can not find any document for helping on this. Please help me if you have any experiences with this, thank you.

2

Yes. Keycloak supports Yubikey with WebAuthn. Docs are here Server Administration Guide

3

Yes I known Keycloaks support Yubikey with WebAuthn, but just only when register/login. I want to require Yubikey every time admin update User’s information.

4

I don’t think so. It’s possible via step-up for a client you configure, but I don’t think it’s available for the admin.