Federated users are not able to reset password

I am using this GitHub - opensingular/singular-keycloak-database-federation: Keycloak User Storage SPI for Relational Databases (Keycloak User Federation, supports postgresql, mysql, oracle and mysql) for enabling user federation. I have an app and the users table is already there in DB with hashed_password column. But now I want to use keycloak. When the user present in my DB tries to reset the password using Keycloak, KC does send a reset password email and when I click on the link and enter new password, and submit the form KC gives below error

2022-12-12 14:09:45,381 WARN [org.keycloak.events] (executor-thread-190) type=UPDATE_PASSWORD_ERROR, userId=f:afc32065-4ab0-4a2b-a2a9-f9411d35e0ae:2, error=password_rejected, reason='Password update not supported', auth_method=openid-connect, custom_required_action=UPDATE_PASSWORD, response_type=code