以前のエントリが古いため、クラスタをAIQUMに追加できません

ActiveIQ Unified Manager（AIQUM）9.6＋

GUIでエラーが発生し、AIQUMにクラスターを追加できません：
Unable to add cluster datasource. This can occur if the clocks on the systems are not synchronized and the Active IQ Unified Manager HTTPS certificate start date is later than the date on the cluster, or if the cluster has reached the maximum number of EMS notification destinations
クラスターは以前に正常に追加されなかった可能性があります
server_acq.log：
Fail to add data source for acquisitionUnitName: local, dataSourceName: <cluster_ip_or_fqdn> .. .. : com.onaro.sanscreen.acquisition.sessions.AcquisitionUnitException Name <cluster_ip_or_fqdn> already used by another datasource
server.log
ERROR [org.springframework.boot.web.servlet.support.ErrorPageFilter] (default task-4573) Forwarding to error page from request [/server/datasource] due to exception [Fail to add a new DS, message:Name<Cluster Name or FQDN>already used by another datasource]: com.onaro.sanscreen.acquisition.sessions.AcquisitionUnitException

Fail to add a new DS, message: Name <Cluster Name or FQDN>already used by another datasource