Google Nest does not make it easy to change Wi-Fi settings on many of its Google Nest devices. So their first recommendation, when getting a new router/modem, is to set the network name (SSID) and password to the same values used on your old router/modem. We did that when we got a new router/modem a year ago, and all of our Google Nest devices came back online without any problems.
If that's not possible, then Google Nest's process is to remove each Google Nest device from the Google Nest app or Google Home app while still on the old Wi-Fi network with the old router/modem, then do a factory reset, and then re-install while on the new router/modem and the new Wi-Fi network. Failing to perform the first step often leads to issues that are difficult to resolve.
To reach Google Nest Support, start with this link: https://support.google.com/googlenest/gethelp
@MplsCustomer, thanks for the help.
@Longdrvr, I’m sorry to hear you’re not able to connect your Nest devices to your new router. A few questions: what Nest devices do you have? What is the error message when doing the set up? Since this is a new router, try the steps below:
If your speaker or display isn’t connected to a Wi-Fi network, set up your speaker or display on the new Wi-Fi network:
If your speaker or display is connected to an existing Wi-Fi network, but you'd like to connect it to a new one, follow the steps below:
If you get an error message that says "could not communicate with your [device]" when you try to forget your network, or the steps above don't work, you'll need to factory reset your device and set it up again.
Keep me posted.