HRESULT 0x803100A2: meaning and diagnosis

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

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FVE_E_PROTECTOR_CHANGE_PIN_MISMATCH	FVE_E_PROTECTOR_CHANGE_MAX_PIN_CHANGE_ATTEMPTS_REACHED

FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED

The exact BitLocker boundary

FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED (0x803100A2) identifies the point where policy and authorization context do not permit a standard user to change the PIN through this path. For FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED, note: A BitLocker key protector wraps access to the volume master key. When diagnosing FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED, remember: 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.

For FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED, note: Never capture PINs, passwords or recovery passwords in logs. When diagnosing FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED, remember: IDs, types, policy, call result and attempt counters are sufficient for most diagnosis.

Do not confuse it with a nearby failure

Keep this separate from a wrong PIN or malformed new PIN; the request is rejected before secret validation matters. For FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED, that distinction determines whether the next check belongs to policy, protector inventory, volume geometry, firmware, account escrow or the calling application's buffer contract.

Evidence that distinguishes the condition

For FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED, record caller token and group membership, UAC elevation, policy controlling standard-user PIN changes and the selected UI/API path. For FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED, keep the full HRESULT and the first method that returned it because later cleanup calls can report a different state.
For FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED, capture manage-bde -status and the protector inventory for the exact volume GUID, not only the drive letter, because letters can change in WinRE, clusters and deployment environments.
Export BitLocker operational events for the FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED failure and note the boot session, caller identity and management source; that evidence separates this BitLocker condition from a generic access or storage error.

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

Safe corrective sequence

For FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED, elevate through the documented administrator reset flow or adjust policy centrally if standard-user changes are intended.
After correcting the FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED prerequisite, refresh protection, conversion and lock state before one controlled retry; a cached UI message is not proof that the FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED condition is still active.
Before a FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED remediation deletes protectors, changes firmware mode, resizes partitions or decrypts a production drive, verify that an independent recovery method is available and escrowed in the intended directory or account.

For FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED, the boundary above identifies which BitLocker state must change before a retry can be meaningful; repeating the call without changing that state only adds noise.

The rejection is about delegation, not PIN correctness

The standard-user path can be disabled even when the user knows the current PIN and the new PIN meets policy. Capture whether the request used the self-service change UI, an elevated administrator reset, WMI or PowerShell because those paths authorize different principals.

Use the documented elevated reset when immediate recovery is required. If routine self-service changes are intended, change the managed delegation policy consistently across the fleet rather than granting local ad hoc rights.

State checks specific to FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED

Checkpoint	How to interpret it for FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED
Before the call	Record the target identity and the pre-call key-protector lifecycle state. For FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED, the decisive boundary is that policy and authorization context do not permit a standard user to change the PIN through this path.
At failure	Preserve caller token and group membership, UAC elevation, policy controlling standard-user PIN changes and the selected UI/API path. This proves whether FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED came from BitLocker itself or from a wrapper translating another result.
After correction	Elevate through the documented administrator reset flow or adjust policy centrally if standard-user changes are intended. The FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED request should then advance without removing an unrelated recovery route.
After reboot or remount	Recheck protection, conversion and lock state for FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED; a successful management call is incomplete if the next boot cannot unlock the volume.

Verification after the change

For FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED, success means more than the absence of a dialog. Confirm that the condition represented by FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED now matches the intended design, that the protector inventory has not lost an independent recovery route, and that the next reboot or remount can unlock the volume. If the FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED request advances to another HRESULT, record both values in order because that transition reveals the next unmet prerequisite.

References

Reference set for FVE_E_PIN_PROTECTOR_CHANGE_BY_STD_USER_DISALLOWED:

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