Macbook Air 2020 - Wifi does not work after update Big Sur this morning (OS11.1)

I updated Mac OS this morning (December 15th, 2020). After the update, WIFI does not work. It recognizes the network, it appears connected (network icon shows it) but when I click on a bookmark or type a URL, takes a long time and gives no internet message. I took the computer to work and the same thing occurs. Our computer helpers have no idea about what is going on. I really need that computer to work ...

Any help or clue to solve it? Thank you.