[keycloak-user] Alternative sub flow

Hi I have been trying to configure a keycloak flow but have not been successful, and I am wondering if what I am trying to do is possible. We have the standard flows Cookie Kerberos Identity Provider Redirector Browser Inside the Browser flow we have Username Password Form 2SV - sub flow required OTP execution - alternative SMS execution - alternative The OTP and SMS executions are custom authenticators, that I'd like to have at least one of them. With this configuration I can see the OTP authenticator returns a form from the challenge method, but it doesn't show the form. The authentication just passes and I am logged in without asking for either the otp or the sms code. Can I use the alternative requirements in this way? Matt