i am trying run the package
exec sysman.MGMT_TARGET.SET_AGENT_TZRGN('bhspdbs00_PROD:1830','America/Buenos_Aires');

and i have the following error:

ORA-20233: Invalid agent name bhspdbs00_PROD:1830
ORA-06512: at "SYSMAN.MGMT_TARGET", line 3683
ORA-06512: at line 1

How can i get the agent name ??

Regards.