wifi seems to work, does not connect to internet

Here's what worked. The WIFI installation apparently was flawed. In the "Network" portion of System Preferences, needed to delete the WIFI item on the left menu (use the - sign below), then add a new WIFI with the +. Voila. Got rid of the old, added the new, and whatever settings were incorrect are gone and new ones, corrected, are in place. Many thanks to Apple telephone support from "Israel" in Florida.

Right, did that first. Same problem. Also, had this problem when I went to a different site - altogether different router, network, etc. I transferred system from Time Machine for my other (older) computer - also on Big Sur. Could there be settings imported from the iMac that need to be changed on the MBP? Thanks Doug