not many FortiNAC users here yet it seems but going to give it a try.
im working on it in a lab environment with FortiGate + managed / fortlink FortiSwitch (6.2) and FortiNAC 8.8.
anyone experiences with that setup working fine? im getting odd issues with having the FortiNAC not seeing the switch state correctly. it simply doesn't want to work well 100%, sometimes it catches something, but too often not, so ending in "an out of sync" state.
the syslog messages arrive at the FortiNAC, that part is ok. it really seems that what happens afterwards that fails.
so far it seems related to the FortiGateOS version 6.2 has issues, 6.4 works better. haven't had a definite answer from FortiNAC experts and there isn't a known issues list so a bit more tricky to look up.