What does HRESULT 0x80310069 (FVE_E_KEY_PROTECTOR_NOT_SUPPORTED) mean?

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The volume metadata version does not support the requested BitLocker protector type.

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FVE_E_POLICY_INVALID_PIN_LENGTH	FVE_E_POLICY_PASSPHRASE_NOT_ALLOWED

FVE_E_KEY_PROTECTOR_NOT_SUPPORTED

Volume metadata version can limit protectors

FVE_E_KEY_PROTECTOR_NOT_SUPPORTED is about the format and capabilities of the protected volume, not merely the Windows edition running the command. A drive created by an older BitLocker version can remain readable while lacking metadata support for a newer protector feature.

Before upgrading, determine whether the drive must remain compatible with older systems. A BitLocker metadata upgrade changes the volume format and should be treated as a planned compatibility operation, not a generic retry.

What to verify

Read the volume's MetadataVersion or BitLocker version and list its existing protectors.
Confirm that the requested protector is supported for that volume type and current metadata version.
Use the documented manage-bde -upgrade path only after backup, recovery-key verification, and compatibility review.
Keep this distinct from FVE_E_INVALID_PROTECTOR_TYPE, where the type is unsuitable for the operation rather than unsupported by the volume format.

References

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