Nighthawk M60 and Google Nest Mini Devices

I have 7 Google Nest Minis (speakers). I setup my new network with the Nighthawk M60 mesh wifi system. I named my SSID the same as my previous. I tried using the Google Nest Minis and they work very intermittent at best. So I decided to see if I could just run through the setup process through the Google Home app. No luck. So I read multiple places that I should factory reset them and try running through the setup with the Google Home app. I have tried that. It will run through the entire process. I hear a noise, I accept the agreements, I select my wifi network, then click next. I get a screen that says connected, then I get this error screen:

Google Home app error message 

Error Message

I know it is trying to connect to the 5GHz band... but I believe it needs to connect to a 2.4GHz band? Any way to force devices to a certain band? This is pretty frustrating. Right now I have 7 paper weights. Any help would be appreciated!