AIQUM fails to add ONTAP cluster by "Unable to add cluster datasource" due to certificate

• Active IQ Unified Manager (AIQUM)
• ONTAP 9

• Following error is displayed while adding new cluster to AIQUM

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.

• server_acq.log indicates following error

JJJJ-MM-DD hh:mm:ss,523 ERROR [default task-6] c.o.s.a.s.AcquisitionFacadeUtil (AcquisitionFacadeUtil.java:202) - failed to register EMS: : com.netapp.oci.netapp.client.interfaces.data.EmsManagerException: Failed to read the certificate due to incorrect formatting. (errno=61102)
...
JJJJ-MM-DD hh:mm:ss,532 ERROR [default task-6] c.n.s.a.s.r.s.i.AcquisitionFacadeSessionServiceImpl (AcquisitionFacadeSessionServiceImpl.java:813) - Fail to add data source for acquisitionUnitName: local, dataSourceName: <IP:NNN.NNN.NNN.NNN>, vendor:NetApp OCI Essentials, model: NetApp OCI Essentials, datasourceTypeId: 91, manual: 1, isActive: false, attrs: -- listing properties --
...

• server/audit.log incicates following error

Month. DD hh:mm:ss [:INFO]:<Server-Name>:API:in:[<IP:CCC.CCC.CCC.CCC>]::GET: Fetching cluster certificate for host <IP:NNN.NNN.NNN.NNN> over port 443
Month. DD hh:mm:ss [:INFO]:<Server-Name>:API:action:[<IP:CCC.CCC.CCC.CCC>]::Adding datasource host <IP:NNN.NNN.NNN.NNN>
...
Month. DD hh:mm:ss [:ERR]:<Server-Name>:API:action:[<IP:CCC.CCC.CCC.CCC>]::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.