If the connection you are using is FC Connection then you would need to give FC Initiators WWNs.

iSCSI Qualified Names (IQN) are required to connect the hosts to the array in case of iSCSI Network not FC.

You would need to give WWNs in FC connection.

maybe they referred to the iqn utility, you can use it to display LUN wwn

ftp://ftp.emc.com/pub/symm3000/inquiry/

I hope you are talking about the LUN Unique ID (UID) which can be found from properties of the LUN.

Was it requested by EMC Technical Support?

If yes, you can PM me the Service Request Number and I'll try to check what is the context and what is required exactly.