Add a password hash provider to handle BCrypt passwords inside Keycloak.
mvn clean package
curl http://central.maven.org/maven2/org/mindrot/jbcrypt/0.4/jbcrypt-0.4.jar > jbcrypt-0.4.jar
KEYCLOAK_HOME/bin/jboss-cli.sh --command="module add --name=org.mindrot.jbcrypt --resources=jbcrypt-0.4.jar"
curl -L https://github.com/leroyguillaume/keycloak-bcrypt/releases/download/1.1.0/keycloak-bcrypt-1.1.0.jar > KEYCLOAK_HOME/standalone/deployments/keycloak-bcrypt-1.1.0.jar
You need to restart Keycloak.