ltb-passwd cannot modify user password

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My startup steps are:

helm repo add helm-openldap https://jp-gouin.github.io/helm-openldap/
helm install my-release helm-openldap/openldap-stack-ha

ltb-passwd service error log is:

said into stderr: "NOTICE: PHP message: LDAP - Modify password error 50 (Insufficient access)

Do I need to set anything on the default configuration? @jp-gouin