@AdminCat yes, you should have a switch that you can manage, alternatively you can connect the access points directly to the router, then vlan will work on WiFi

@AdminCat sorry but I see you have an unmanaged switch now, you must have a managed switch to be able to use vlan,

@AdminCat yes, it looks like this, have you tagged the switch with vlan 10 and 20? or are the access points connected directly in the router?

@AdminCat hmmmm, when you create VLAN do you enabled interface on router conneted to the switch?

@AdminCat there have been many problems with DHCP on all tp-link routers for a long time, this should probably be solved with the latest firmware upgrade, so try adding version 2.1.2 to your router,...

@Zosha You can do this in controller version 5.8 i Guess this is available to oc200 soon. This is done on router property and ports.