Understood, that is not a "password" dialog. Try looking for your bitlocker key via the link
https://support.microsoft.com/en-us/windows/finding-your-bitlocker-recovery-key-in-windows-6b71ad27-0b89-ea08-f143-056f5ab347d6
otherwise, the only other option is a clean install.
--please don't forget to upvote and Accept as answer if the reply is helpful--