Are you using subtitle sync in bazarr? I don’t use jellyfin, but have found that bazarr has fixed most of my subtitles that were not in sync just by enabling the option. I think it’s CPU intensive though, so don’t do the whole library at once.

I love my Yubikey but the older hardware versions can only store 25 passkeys, and I believe even the newer ones can only store 100. That seems like a lot until more sites start allowing passkey auth.