What does HRESULT 0x80310029 (FVE_E_AUTOUNLOCK_ENABLED) mean?

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Auto-unlock is still enabled for associated data drives, so BitLocker cannot be turned off on the OS drive.

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FVE_E_NOT_OS_VOLUME	FVE_E_WRONG_BOOTSECTOR

FVE_E_AUTOUNLOCK_ENABLED

FVE_E_AUTOUNLOCK_ENABLED means that BitLocker cannot be turned off on the operating-system drive while associated fixed or removable data drives still use auto-unlock. The auto-unlock relationship depends on key material stored with the OS drive.

How to investigate for FVE_E_AUTOUNLOCK_ENABLED

Identify the data drives configured for auto-unlock on this computer before changing OS-drive protection.
Disable or reconfigure auto-unlock deliberately, then recheck the OS-drive status.
Ensure that each affected data drive has an independent recovery method before removing the relationship.

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