Below is a sequence of steps that have been compiled by @dh024 (with contributions from @ConsistentCorgi) for troubleshooting biometrics problems in the FireFox extension. It would be worthwhile trying this procedure with your Vivaldi browser extension, to see if it helps:
- disable biometrics in the FF extension
- uninstall the Bitwarden desktop app
- install the desktop app again from this download: https://vault.bitwarden.com/download/?app=desktop&platform=windows (don’t use Windows Store version)
- enable biometrics in the desktop app
- enable desktop integration in the app
- enable biometrics in the FF extension
- if necessary, enable Require verification for browser integration
Let us know whether the above procedure works for you.