What does NTSTATUS 0xC0210009 (STATUS_FVE_ACTION_NOT_ALLOWED) mean?

STATUS_FVE_ACTION_NOT_ALLOWED

Meaning and context of STATUS_FVE_ACTION_NOT_ALLOWED

This is a state-machine rejection from the BitLocker control engine, not a Windows ACL decision. The same account can be authorised to manage a drive while a particular verb is still invalid because conversion, protection, lock state, or drive role makes it unsafe at that moment.

Read the current conversion status, protection status, lock state, and key-protector configuration before retrying. manage-bde -status is useful because it shows state that a simple drive-letter check cannot express.

Compare the intended operation with the actual drive type and lifecycle stage. For example, a request intended for an unlocked data drive should not be retried blindly against an operating-system drive or a drive whose conversion has not reached a compatible state.

BitLocker operations guide | manage-bde reference | manage-bde protectors reference

Native status interpretation

STATUS_FVE_ACTION_NOT_ALLOWED is 0xC0210009, an NTSTATUS error value. AllStat describes it as “Requested action not allowed in the current volume state.”