@Keith_Dixon Yes you can extend your wired network via mesh, connect meshed ap to a switch or what ever on rj45 direct in ap or to free port in poe adapter if you use EAP610-Outdoor you have poe...

@Keith_Dixon there is no problem and mesh then from meshed ap connect a wired network in the remote building. almost all ap have mesh except in wall series.

@DanBulmer I get the same erreor but I have not enabled this port, have you enabled this on wan?

@samindia Maybe this will help you a little, https://community.tp-link.com/en/business/forum/topic/273206

@DanBulmer Ok Controller Version:5.1.7 that realy old version, this controller dont have support for ER8411 so upgrade to latest will fix your problem. supported device is this on your controller

@DanBulmer What version is your controller? I have option to change on my ER8411