we have two TL-WA1201 and are thinking about using those with Multi-SSID, VLAN and AP isolation so that all users of the wireless networks can't communicate with other devices on the networks except the with router.
We would of course like for this feature to be PER SSID, but we're okay with it being on for all SSIDs.
We currently have both devices running in Multi-SSID mode and all SSIDs on VLAN1 because we don't have bought managed switches yet.
The user guide on page 24 specifically shows check boxes for 2.4GHz and 5GHz that read "AP Isolation Feature:  Enable AP Isolation" and on page 25 it says "AP Isolation Feature: This function allows you to confine and restrict all wireless devices on your network from interacting with each other, but still able to access the Internet. AP isolation is disabled by default."
On the devices themselves those two checkboxes are missing. But under "Wireless"->"Wireless Advanced" when clicking on the (?) in the top right, the AP Isolation Feature is still advertised and explained.
The emulator ( https://emulator.tp-link.com/1201-multissid/index.html ) isn't helping either since that isn't showing any checkboxes at all under "Wireless"->"Wireless Advanced"
So is there some setting we're missing or don't understand or has this feature been disabled?