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Cannot set auto unlock for C drive

PatrickQs 56 Reputation points
2020-12-01T14:56:08.02+00:00

After enabled bitlocker on my laptop without TPM, I cannot set auto unlock option for my system drive. no such option were shown in the control panel, I successfully set it for my local D drive.
then I attempt to use command, I got the following massage:
Error: automatic unlock cannot be used on the OS volume

OS version: Windows 10 enterprise, 2004 build 19041.508, in company domain

What should I do? any help is appreciated!!

44125-control-panel.png44143-cmd.png

Windows 10 Security
Windows 10 Security
Windows 10: A Microsoft operating system that runs on personal computers and tablets.Security: The precautions taken to guard against crime, attack, sabotage, espionage, or another threat.
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  1. Bagitman 581 Reputation points
    2020-12-01T20:07:26.853+00:00

    That is expected behavior.
    Only with a TPM you could boot the OS without providing credentials.

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  1. Jenny Feng 14,151 Reputation points
    2020-12-02T06:45:35.763+00:00

    @PatrickQs
    Hi,

    You do not actually "auto unlock" the OS drive itself. If you're referring to the C: drive. If the OS drive is encrypted and you boot from it, it automatically unlocks at boot. "auto unlock" only applies to drives attached to the computer other than the OS drive.
    Hope above information can help you.

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