Functionality of physical ports

Hi everyone,

     I am a bit new to Fortinet, and I am stuck with a situation where I need some help or at least some ideeas.

     I am using a Fortigate 600 as a firewall for a client. It is separeted into 3 different zones :one interface type - it is connection with 3rd party client on Port 8, one softawre siwtch on ports 1, 2 and 3 for switching a vlan; and for the second vlan there is also a sftware switch with ports 4,5,6,7. Somehow, because it wasn't really considered correctly at the beggining, 2 more ports need to be aded the Software switch containing 4,5,6,7. Because of psyhical contraints, no other port availeble, I use FSP convertors. And I tried several option 1 - ports 9 and 10; 2 ports 11 and 12; 3 ports X1 and X2.

   The SFP ports were not connectiong on any of those test. They are still greyd out in the GUI. 

   Is this because theose are muttualy exclusive samehow? Or I am missing some communication? 

    I can only state that on the command: " get system interface transceiver" the Fortigate was informing me on what ports I can see the SFP convertor. But that was all. 

    Any ideea would be much appreciated.

     Thank you.