Even if i plug the access points directly into the router the DHCP will not work. So its not the fault of the switch. Edit: I now upgraded the software controller from 4.3.5 to 5.8.4. But still no IP...

@shberge Okay i replaced the unmanaged switch with a smart switch and configured the ports as followed: Port 1 = Uplink VLAN 10|20 Port 2 = access point 1 VLAN 10|20 Port 3 = access point 2 VLAN...

The switch is a unmanaged one. Does a unmanaged switch remove the vlan tag? Do i need a managed switch to merge VLAN 10 on port 1 and VLAN 20 on port 2 on the uplink port 3 to VLAN 10|20?

@shberge I think i have done it right. This is the working LAN: This the NOT working LAN:

i just updated, but the problem still exists.

I just updated the router to the latest firmware version but still wont work. In this attachment you can see that only in the Guest-network the dhcp work correcty.