@Joseph-TP the post is on this site and is https://community.tp-link.com/us/home/forum/topic/213812?replyId=468042 In addition as you say it basically a replication of an ethernet connection at layer...

Is there anything that I need to do to setup these adaptor to allow tagged vlan traffic. Yes there are post that says this should work, its a layer 2 device so should work but there is another post...

@GeorgeBark no, my solution is to run the guest WiFi connected to the guest vlan from my routers WiFi only and for my work laptop that's too far away for the guest WiFi so I have used ethernet over...

Not good but they don't seem to care...

@NYSunDevil totally agree with the current setup in AP mode you have one WiFi network with no actual traffic saparation and 2 network names SSID's. Which is not what anyone in IT would call a guest...

@kaisarturan that was my point they are not cheap and are high end so should have this basic feature.