Enable "IP passthrough" / bridge mode / bypass mode on the Inseego unit. Ask your ISP how if you can't figure it out yourselves. More about double NAT (what you want to avoid):
Then connect the Nest Wifi main/primary unit by ethernet cable to the Inseego RJ-45 ethernet port.
If Nest Wifi still does not get online, factory reset Nest Wifi units using the physical button, and delete the network from your Google Home home:
Then set up Nest Wifi from scratch:
@olavrb, I appreciate the assistance you provided.
Thanks for reaching out, @chrisgod1. I'd like to check if you were able to find your Google Nest Wifi router and point. Were you able to perform the steps and access the links that olarvb provided? If you are still unable to connect to your new ISP, you know where to find us.