Google Nest not getting an internet connection

[Izzy3]

I switched my internet service to a new provider and am using the modem and wireless router the ISP provided, modem and router are separate units.  Unfortunately I am not getting good internet service in a couple rooms with the ISP provided wireless router.  Because my Google Nest mesh router provided acceptable service, unplugged the ISP router from the modem and I tried plugging the Google Next mesh router into the ISP provided modem.  I did reboot the modem.  Unfortunately I am not getting an internet connection to my Google Nest router.  Any suggestions on the fix?

[David_K]

Did you reset your Nest Wifi router? You need to do that if you change the external connectivity.

Factory reset your Wifi device - Google Nest Help

Scroll down and select “My device isn’t available in the Google Home app”. 

Who is your ISP? Do they support third party routers with their equipment?

[Apsilon778]

Would advise contacting your ISP and ask if you need additional setup to connect a 3rd party router.
It could be the mac address needs to match their system and when the routers change it doesn't match therefore no authentication.