Okay, just figured out why I couldn't find my earlier post -- there's both an English forum and a US forum: https://community.tp-link.com/en/home/forum/32?page=1...

@Tony Thanks for the reply, Tony. I solved the issue the other night by changing the Mode from "802.11a/n/ac/ax mixed" to "802.11a/n/ac mixed" as you proposed. I don't have any ax devices right now...

I just setup a new TP-Link Archer AX50. All of our wifi devices (phones, laptops, tablet, TV) can see the networks (2.4G and 5G) and connected fine except for one: a Lenovo Yoga 700 laptop. It can...