What does HRESULT 0x8031002D (FVE_E_CANNOT_SET_FVEK_ENCRYPTED) mean?

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BitLocker cannot change the encryption key and method while the volume is already encrypted.

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FVE_E_POLICY_PASSWORD_REQUIRED	FVE_E_CANNOT_ENCRYPT_NO_KEY

FVE_E_CANNOT_SET_FVEK_ENCRYPTED

FVE_E_CANNOT_SET_FVEK_ENCRYPTED means the requested encryption configuration cannot be applied to a volume that is already encrypted with a previous configuration. A full supported transition is required before changing this fundamental setting.

What to check

Use manage-bde -status to confirm whether encryption or decryption is complete.
Plan the transition so recovery keys and backups remain available throughout the process.
Do not attempt to overwrite the encryption method by editing metadata or manipulating key protectors.

manage-bde -status C:

Microsoft: manage-bde -status

Microsoft: manage-bde

Microsoft: BitLocker operations guide

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