Edge browser extension biometrics won't enable

I encounter a vexing problem trying to enable Edge browser biometrics support on a windows PC. The desktop is configured to use “Windows Hello” and it works (both face ID and PIN). It also has “Enable browser integration” selected and is running/unlocked via an open window. However, selecting “Unlock with biometrics” via the Edge extension settings just produces a popup message “Start the Bitwarden Desktop application” with the further description that the desktop must be running to use biometrics in the extension. Any thoughts are appreciated.