[keycloak-user] How to login without username and password

Hi developers, I want to use mobile number and SMS text code to login to keycloak. But keycloak requires username and password to login. I copy Authentication of Browser, and remove "Username Password Form", and I add my own "Mobile OTP" SPI. When I open login page, it shows "Invalid username or password", the log says " 21:00:03,638 WARN [org.keycloak.events] (default task-106) type=LOGIN_ERROR, realmId=test1, clientId=security-admin-console, userId=null, ipAddress=127.0.0.1, error=invalid_redirect_uri, redirect_uri=http://localhost:8080/auth/admin/master/console/ 21:00:45,711 WARN [org.keycloak.services] (default task-107) KC-SERVICES0013: Failed authentication: org.keycloak.authentication.AuthenticationFlowException: authenticator: mobile-otp-authenticator" Is there a way to remove "Username and Password Form" and login with my own SPI? Or can I override default "Username and Password Form" with my own logic? I mean "override" is: I write a new SPI without changing keycloak source code. If I can't achieve this, I think I need to use other OAuth open source application and bind to keycloak as an Identity Provider and change the source of OAuth application to achieve my goal. It will be better if I can achieve my goal without another IdP. Thanks in advance.