As far as I know, Bitwarden currently doesn’t support accessing the app by passkey or storing passkeys. Both features are coming soon, but they aren’t available yet. You can see more information about them in the Bitwarden blog post here: Bitwarden to launch passkey management | Bitwarden Blog and on the Bitwarden roadmap here: Bitwarden Roadmap .
Your post seems to have a lot of implied questions about a less-used configuration, which may be why you haven’t gotten any responses yet. In my experience, people on Reddit are more likely to respond to questions about specific use cases.
If you still have questions after reading the links above, I suggest breaking them down into smaller manageable chunks and posting them on Reddit one at a time. Just keep in mind that many people have short attention spans, so it’s best to keep your posts concise.
Good luck.