@Alexandre. The switch was the problem. Bypassing it worked and I tried with a small Zyxel (GS-105I) switch I had lying around, which also worked. Unrelated side note: The inability to paste...

@Alexandre. It is setup like the second way. I will try switch bypass as soon as I can.

I have 4 deco x50 units, all setup in AP mode. They all connect to a TP-Link TL-SG1024DE switch. For some reason 1 of the 3 satellite decos is always in wifi backhaul mode. If I reboot the wifi deco,...