@gridflash smart connect kinda bonds the SSID. The router will choose which band to connect to. So your device will see only one SSID but both bands are being broadcast.

Does Smart Connect enables MU-MIMO?

@Carl Hi Carl, I'm facing the same issue with an AX 6000. It keeps all my wifi 6 devices on 2.4 ghz even when in the same room as the router. 24 hours went buy and nothing has changed. What the point...

@StevenRN Did it fix for good? One thing I noticed with TP-Link routers is that over time the slow speed comes back. I have a C5400 and face the same issue.

I just purchased an Archer AX6000 to replace my aging Archer C5400 and I'm having the exactly same problem. I have 26 devices connect, out of those 16 are 5 GHz capable and only 2 connect to the 5...