@Confluence Failover and Load-balancing are mutually exclusive in my book, do you know something different? Disable load-balancing and retry your failover scenario. You clearly have some kind of...

Did you assign a VLAN to the SSID running on AP_Hal? If so try removing it for testing ie use VLAN 1 untagged. How does the firmware version on the B&B AP compare with some of your other sites?...

I suspect the issue is with how or where AP_Hal is connected. If you temporarily disconnect this AP from the system does the rest of it perform as expected? Is there any way you can connect this AP...

@Sc0th Me too. My Docker based controller is already at 5.3.1 but my OC200 lags behind at 5.1.7. I have no idea why the lengthy delay in releasing it on known and well controlled hardware.

@nspr What firmware version are the 225's that work vs those that don't?

@doremifajb Props for the musical reference. I believe what's going on is that your APs are treating the traffic as tagged, and the non-TPlink router WiFi is not. I do not know what kind of port...