What does HRESULT 0x803100C1 (FVE_E_PASSPHRASE_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED) mean?

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You must be logged on with an administrator account to change the password. Click the link to reset the password as an administrator.

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FVE_E_PROTECTOR_CHANGE_MAX_PASSPHRASE_CHANGE_ATTEMPTS_REACHED	FVE_E_LIVEID_ACCOUNT_SUSPENDED

FVE_E_PASSPHRASE_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED

Why this is not a generic disk error

The practical meaning of FVE_E_PASSPHRASE_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED is that the standard-user security context is not permitted to change the BitLocker password protector. The HRESULT is 0x803100C1.

Three decisions before remediation

Is the result target correct?: Use the volume or protector GUID and confirm its role; do not rely only on a drive letter or friendly name.
Is the result request allowed?: Resolve effective policy, Windows edition, caller token and management source for the key-protector lifecycle operation.
Is the result state stable?: Record conversion, protection, lock and reboot status before modifying anything.

A BitLocker key protector wraps access to the volume master key. TPM, TPM+PIN, startup key, recovery password, password, certificate and Network Unlock protectors have different volume and policy rules; changing one is not the same as decrypting the volume. Never capture PINs, passwords or recovery passwords in logs. IDs, types, policy, call result and attempt counters are sufficient for most diagnosis.

Why a common workaround is wrong

This should not be diagnosed as a password-format failure; authorization is evaluated independently of the proposed new secret. That nearby condition needs a different corrective action and may produce a similar user-facing message.

Confirm the returning layer

manage-bde -protectors -get C:
powershell -NoProfile -Command "Get-BitLockerVolume C: | Format-List KeyProtector,ProtectionStatus,VolumeStatus"

Correct the configuration deliberately

Perform the documented elevated reset/change operation or revise managed policy if delegated changes are intended.

State checks specific to FVE_E_PASSPHRASE_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED

Stage	How to interpret it
Before the call	Record the target identity and the pre-call key-protector lifecycle state. The standard-user security context is not permitted to change the BitLocker password protector.
At failure	Preserve caller token, elevation state, effective policy, target drive type and change versus reset API.

References

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