I am having the same issue with my 2020 Sierra 1500. I pay monthly for the Wi-Fi from AT&T. My phone connects fine to the trucks router, but there is no internet signal once connected. While driving, the screen displays a message requiring me to enter my password to continue online services, and when password is entered, it advises invalid password.
I have had it in to the dealer with no success.
I spoke with OnStar, who manually reset my password for me, which also did not solve the problem. I disconnected the battery overnight, and still no success.
Any suggestions would be greatly appreciated.
RJ