Model : TL-SG105E

Hardware Version : TL-SG105E(UN)_v2

Firmware Version : TL-SG105E(UN)_V2_160526

ISP : Telfort (NL)

Situation:
Provider Telfort has two VLAN's to which all services connect.
34, for internet & VOIP telephony
4 for IPTV

I don't use IPTV, so I don't require those packages

I only require the traffic from VLAN 34 and require that data to be transferred untagged, so I can use my own router.

SETUP with SG108
I only require to use 2 ports
Port 1, which is a tagged port for VLAN 34, will be the uplink it receives the incomming Internet traffic from the provider, through a Genexis Fiber2Lan converter.
Port 2 which is an untagged port for VLAN 34, and exits to the router

SETUP of the SWITCH
MTU VLAN = Disable
Port Based VLAN =Disable
802.1Q VLAN = Enabled
Settings
Port 1: Tagged
Port 2: Untagged
VLAN ID: 34
802.1Q PVID Setting
Port 1,2 both set to 34
All other settings, left to default
IGMP snooping = Enabled
RESULT:
Asus router receives IP address from DHCP server of provider. No issues, Internet traffic works fine.
HOWEVER
When i tried the same settings in the TL-SG105E, the router is NOT able to receive an IP address from the provider.
The TL-SG105E is Hardware version TL-SG105E(UN)_v2. and has latest firmware, version TL-SG105E(UN)_V2_160526

What did I do wrong here? Are these devices the same, or are they different?