Hello,
I do have a similar setup, FG60E (6.4.8)/ICX7150-C12P (08.0.95f) with LAG.
There might be some differences in VLANs and other setup, but here is part of my config for your reference:
ICX:
SSH@ICX7150-C12 Router#show conf
!
Startup-config data location is flash memory
!
Startup...