@UKJim wonder if this looks vaguely familiar :) https://static.tp-link.com/upload/case-study/2024/202405/20240502/B2B_BMW%20Golf%20Tourney_Case%20StudyFINAL.pdf

@Morris211 probably not, at least not at the AP level. Looks like AP14 is happy enough, it's just the controller that's confused. My guess is the uplink is working just fine. Sometimes...

@Sefinek Why the double-NAT? Can you not put your ISP modem in 'bridge' mode? If not, then can you at least set up the Omada gateway as the DMZ IP of the ISP router?

@Aisaya You need to get the AP UNDER the metal roof. Currently most of your radio power is being reflected off into outer space.... I would put it in a central hallway, or other location with as much...

@SUNSONIC Agree on router change...and ER605v2 is a good choice as the other is the ER7206 but it is getting old product-wise. All the other routers don't seem to get the love/attention from TPlink...

@GregVLAN If you have the full Omada stack (managed router and managed poe switch), then you could put the AP(s) on a tagged management VLAN and create rules to block traffic except from known MACs....