[keycloak-user] User creation

Hello, I'm trying to implement a two-step registration process based keylock. On the first step enters the same information as in the default registration form, but with the addition of telephone number. On the second step, he enters a code received via an SMS message. The problem I faced is that if a user successfully filled the first step registration form and failed to enter a valid code on the second step, he is not able to use the same email address on the first step(because of "Email already exists." error). Is there a way to clean up not fully registered users and allow them to re-register if they have not finished all the step from the registration flow. Best wishes, Pavel