24H2 update - running out of ideas.

By default, it is enabled automatically on some SKUs. According to the official documentation, you have to use the command line to disable it, which means pressing SHIFT + F10 on the Setup screen, or just disabling it from within the Windows Preinstallation Environment. If you don't want to disable it, or it uses a password or key that you don't have, and all your personal files are already backed up, then it might be necessary to reformat using diskpart and the https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/cc753770(v=ws.11)#parameters parameter:

https://learn.microsoft.com/en-us/windows/security/operating-system-security/data-protection/bitlocker/

https://learn.microsoft.com/en-us/powershell/module/bitlocker/disable-bitlocker#example-1-disable-bitlocker-for-a-volume

https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/fsutil-behavior#parameters

https://learn.microsoft.com/en-us/windows/security/operating-system-security/data-protection/bitlocker/operations-guide