Zoom 64-bit, sign in with google does not work

After upgrading from 32 to 64-bit (5.9.3-3169) on Win-10, clicking "google" to sign in with stops short; it gets to the page displaying "Zoom should launch in a few seconds. If not, please click button below."

but the app does not sign in and clicking the button does not appear to do anything; Tried with Firefox and Chrome.

New install on Win-11 with Edge has the same result