What does HRESULT 0x8031001D (FVE_E_KEY_REQUIRED) mean?

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BitLocker requires at least one key protector, so the last protector on the volume cannot be removed.

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FVE_E_CONV_WRITE	FVE_E_CLUSTERING_NOT_SUPPORTED

FVE_E_KEY_REQUIRED

FVE_E_KEY_REQUIRED means that the operation would leave the encrypted volume without a required BitLocker key protector. BitLocker prevents removing the last usable protector in this situation.

How to investigate for FVE_E_KEY_REQUIRED

List the volume protectors and identify which one the request attempted to remove.
Add and verify an approved replacement protector before removing an obsolete one.
Back up recovery information before any protector change and retain it outside the encrypted volume.

Microsoft: BitLocker FAQ

Diagnostic discriminator: Enumerate usable BitLocker protectors before removing or changing keys. This status means the requested operation would leave the encrypted volume without a required usable key protector.

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