H500 IN POE port configuration on a 3rd party switch

[yassine_ben_sli]

I have connected a ZoneFlex R500, T300 and H500 to a cisco switch using the following configuration on the cisco switch ports:
switchport mode trunk
switchport trunk native vlan x (x as APs Management VLAN)

The R500 and T300 get an IP adress from the DHCP server on the cisco switch and are able to discover the smartzone 100. The H500 can't seem to be able to get an IP adress from the cisco switch.

I have tried these two other configuration on the cisco switch port:
switchport mode trunk
switchport trunk allowed add x
and
switchport mode trunk
switchport access vlan x
still no DHCP adress is bound to the H500.
My question is, what is the required configuration for the port on which the H500 is connected to so it can get an IP adress and discover the controllor?