@Ksg235 

Try enabling the guest network, and only enable the 2.4Ghz.

You can possibly see if Free Roaming is in the Advanced menu. If so, disable that and see if the Nest device will now connect.

@Ksg235 I'm having the exact same issue on my end with the x60 mesh. The Thermostat detects the network, but when I try accessing it, the process fails. I've tried going to just a 2.4GHz network as well. My old wireless router (2.4/5 non-mesh) allows it to connect without issue, so I know the thermostat isn't broken.

@Sentient @Ksg235 I've got the same problem with the X60 mesh but instead with a Honeywell WiFi thermostat.

The Thermostat detects the network, but when I try accessing it, the process fails. I've ALSO tried going to just a 2.4GHz network as well. My old wireless router (2.4/5 non-mesh) allows it to connect without issue, so I know the thermostat isn't broken.