@dh024 I’m having the same problem with Biometric login as Ron_B above. I initially had a slightly different issue - getting the error message “Start the Bitwarden Desktop application. The Bitwarden Desktop application needs to be started before this function can be used”, when trying to unlock with Biometric (despite the desktop app already being open).
So I uninstalled and reinstalled the extension, uninstalled and reinstalled the desktop application like you described above, and enabled biometrics + browser integration in the desktop app. Up to now, all good; I can unlock the desktop app with Windows Hello. But when I try to enable Biometric in the extension, I get the “Browser integration is not enabled” error message.
Edit: Problem seems to have been solved by ticking the additional box “Require verification for browser integration” in the desktop app. I never had this checked in prior versions do didn’t think of ticking it, but after ticking it now the browser extension biometric unlock seems to work fine!