Tried everything recommended here including the location reset- nothing worked.
Want to Network->Thunderbolt bridge - flipped a few times between DHCP and manual and started working again !! with DHCP setting ( and Thunderbolt bridge- not connected).
Maybe just a fluke.
MBAIR 2017
BigSur beta 11.1 (20C5048k)
PankajDubey
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Gandhinagar, Gujarat, India