PRCD-02100
failed to set service {0} of the pluggable database {1} to have cardinality {2}
Cause
The service with SINGLETON cardinality could not be modified to have DUPLEX or UNIFORM cardinality. The service with DUPLEX or UNIFORM cardinality could not be modified to have SINGLETON cardinality. The service created using '-preferred' option could not be modified using '-cardinality' option.
Action
Remove the service resource using 'srvctl remove service' command and add the service resource using 'srvctl add service' with the intended cardinality.