What does HRESULT 0x80310020 (FVE_E_OS_NOT_PROTECTED) mean?

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The operating-system volume is not BitLocker protected, so the requested data-volume operation cannot proceed.

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FVE_E_VOLUME_BOUND_ALREADY	FVE_E_PROTECTION_DISABLED

FVE_E_OS_NOT_PROTECTED

FVE_E_OS_NOT_PROTECTED generally indicates a prerequisite problem: the operating-system drive is not protected, so a dependent data-drive feature such as automatic unlock cannot be configured safely.

What to check for FVE_E_OS_NOT_PROTECTED

Verify protection status for the Windows OS volume before managing dependent data-volume settings.
Confirm that the OS volume has suitable recovery material and a supported protector configuration.
Do not enable automatic unlock as a substitute for OS-volume protection.

manage-bde -status

Microsoft: BitLocker FAQ

Microsoft: manage-bde -status

Microsoft: manage-bde -protectors

Diagnostic discriminator: Check BitLocker protection state on the operating-system volume before configuring the dependent feature. This status is a missing OS-volume protection prerequisite, not a failure of the data volume itself.

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