What does HRESULT 0x80310034 (FVE_E_INVALID_KEY_FORMAT) mean?

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The supplied BitLocker recovery key file is invalid or does not contain usable key material for this volume.

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FVE_E_PROTECTOR_NOT_FOUND	FVE_E_INVALID_PASSWORD_FORMAT

FVE_E_INVALID_KEY_FORMAT

FVE_E_INVALID_KEY_FORMAT means that the supplied recovery key file is corrupt, incomplete, or not valid for the encrypted volume. It is distinct from an incorrect 48-digit recovery password.

How to investigate

Confirm which protector type the recovery workflow expects: a recovery key file and a recovery password are different inputs.
Use the recovery key ID to locate the matching recovery material from the approved backup location.
Keep the original file unchanged for incident review; do not edit it to try to repair its contents.

Microsoft: BitLocker recovery overview

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