Wifi stopped working

I am having the same issue as some others here, starting a few days ago. I can see wifi networks and my phone's hotspot, but it won't connect. I get the password dialogue but it fails to connect. To multiple networks.

I downloaded the supplemental update for macbooks to deal with the T2 security chip issues, thinking this might fix it. Afterwards it connected to my phone's hotspot once, then stopped connecting to anything again.