I am unable to connect to Nest Wi-Fi.
Do you have Google Nest Wifi itself? This is the mesh Wifi system from Google, or are you trying to connect a specific Google Nest product, such as a speaker or display, to your own non-Google Wifi?
I just wanted to check in real fast to see if you saw davidking's reply and to find out if you still needed any help on this. If you're still needing assistance, please just let me know and I'll be happy to continue helping.
As we haven't had any activity here recently I'm going to go ahead and close the thread. If you have more to add, feel free to start a new discussion.
Google Nest Help Center
Chromecast Help Center