Hey, seanfj and seamusvibe.
Sorry about the setup struggles you're seeing. I'm sure it's frustrating to have those devices and struggle to get them on the network. Some devices that require 2.4GHz struggle with the dual-band nature that the Nest WiFi uses, but usually once you get the device set up, there aren't issues keeping it connected. There are some workarounds for devices that don't handle these situations well, so here are a few things you can try.
Try setting up the device at the far edges of your network range. 2.4GHz is a slower speed, but it has a higher range, so the outer edges of your network should be limited to 2.4GHz. You can take your phone and the device to the edges of your range and run through setup, and then move the smart device to where it will be used. This is a common way to work through the 2.4GHz/5GHz issue.
Another way to work this out is if you still have access to your old network gear and you can set it up with the same network ID and password as your Nest WiFi network. Once your 2.4GHz devices connect to that, you can remove the old network setup and the smart devices will connect to the Nest 2.4GHz band correctly as they've already been set up with the same network ID and password.
If neither of those steps are viable for you to try or if they don't work, let me know and we can look at other solutions.
Thanks.
