This is the only option that worked for me so far (deleted device PLUS uninstall driver PLUS disable Driver updates on Windows update in GP). My Avastar driver has also rolled back to the 2016 date but it's al least working. That's more than I could say for the past few days. Will post back if this breaks again.
I have to add that I am on a Surface Book 2 - so this appears to be impacting all / older Surface devices.
EDIT: This stopped working after 3 hours. Lasted much longer than other options, but Microsoft needs to fix this soon.