Oracle Global Data Service and PDB under ADG

Objective: connect to PDB through GSM within ADG configuration. 

I am testing GDS with PDB, The default setup works for non-cdb, however, when I try the same step for ADG that contains PDB, the configuration was added successfully, however I was unable to create service that connect to PDB. (i.e., the -pdbname flag has no effect see below)

Note: I created service named "zydb_ro" that should point to PDB name "PDBZYDB", however, the sqlplus connect to the CDB.

-- Add service as follows:

add service -service zydb_ro -gdspool zyno -preferred_all -role PHYSICAL_STANDBY -failover_primary -pdbname PDBZYDB