FortiLink support security access vlan features has problem

Dear All :

FortiLink can not support Security Access Vlan Features under DHCP structure

our connect like this :

FG600D-Fortilink --> FSW448D --> FSW-224E --> FSW-124E

FortiOS 5.6.7 , FortiSwitch OS 6.0.2

DHCP server using Fortigate or connect from another DHCP server to FG600D other interface

Clients form 448D or 224E or 124E always not working

already set many vlan on different physical switch interface like vlan100 vlan101 vlan201

but need to do the Security Access Vlan feature on each vlan

Can someone have a similar experience to help? Because our customers urgently need to use this feature.

Thanks！

P.S. if not using access vlan features , everything is working properly.

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