HRESULT 0x8031004C (FVE_E_TOKEN_NOT

Status / error code:

Category:

Constant name:

Source:

Facility:

Operating System:

Description:

The access token associated with the current thread is not an impersonated token.

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FVE_E_FS_MOUNTED	FVE_E_DRY_RUN_FAILED

FVE_E_TOKEN_NOT_IMPERSONATED

The failed prerequisite

FVE_E_TOKEN_NOT_IMPERSONATED / 0x8031004C marks a rejected BitLocker transition: the caller invoked a BitLocker operation that requires an impersonation token, but the thread is using a primary or non-impersonated token.

For FVE_E_TOKEN_NOT_IMPERSONATED, note: When policy is the boundary, retrying under SYSTEM does not necessarily help: policy can forbid the operation for every caller. When diagnosing FVE_E_TOKEN_NOT_IMPERSONATED, remember: Separate authorization from allow/require/disallow settings before changing identities.

Diagnostic map

Layer	policy and authorization
Proof to collect	process and thread token types, impersonation level, service identity, COM/WMI hosting path and whether the call crosses a remote management boundary
Different condition	ordinary access denied from insufficient privileges; this code identifies token type and call context rather than only authorization level
First safe change	fix the caller to impersonate the intended client at a sufficient level and revert impersonation cleanly after the operation

For FVE_E_TOKEN_NOT_IMPERSONATED, note: BitLocker evaluates the target volume together with effective Group Policy or MDM policy, Windows edition, caller authorization and the requested protector or management method. When diagnosing FVE_E_TOKEN_NOT_IMPERSONATED, remember: A policy HRESULT therefore describes a rejected configuration decision, not evidence that encrypted sectors are damaged.

A focused verification sequence

For FVE_E_TOKEN_NOT_IMPERSONATED, record process and thread token types, impersonation level, service identity, COM/WMI hosting path and whether the call crosses a remote management boundary. For FVE_E_TOKEN_NOT_IMPERSONATED, keep the full HRESULT and the first method that returned it because later cleanup calls can report a different state.
For FVE_E_TOKEN_NOT_IMPERSONATED, 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_TOKEN_NOT_IMPERSONATED failure and note the boot session, caller identity and management source; that evidence separates this BitLocker condition from a generic access or storage error.

Recommended operational response

For FVE_E_TOKEN_NOT_IMPERSONATED, fix the caller to impersonate the intended client at a sufficient level and revert impersonation cleanly after the operation.
After correcting the FVE_E_TOKEN_NOT_IMPERSONATED prerequisite, refresh protection, conversion and lock state before one controlled retry; a cached UI message is not proof that the FVE_E_TOKEN_NOT_IMPERSONATED condition is still active.
Before a FVE_E_TOKEN_NOT_IMPERSONATED 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.

manage-bde -status
gpresult /h bitlocker-policy.html

Interpretation checkpoint

FVE_E_TOKEN_NOT_IMPERSONATED identifies a condition but not every owner of the surrounding state. Preserve the original caller, volume GUID and event sequence so the correction is applied at the right layer.

State checks specific to FVE_E_TOKEN_NOT_IMPERSONATED

Checkpoint	How to interpret it for FVE_E_TOKEN_NOT_IMPERSONATED
Before the call	Record the target identity and the pre-call policy and authorization state. For FVE_E_TOKEN_NOT_IMPERSONATED, the decisive boundary is that the caller invoked a BitLocker operation that requires an impersonation token, but the thread is using a primary or non-impersonated token.
At failure	Preserve process and thread token types, impersonation level, service identity, COM/WMI hosting path and whether the call crosses a remote management boundary. This proves whether FVE_E_TOKEN_NOT_IMPERSONATED came from BitLocker itself or from a wrapper translating another result.
After correction	Fix the caller to impersonate the intended client at a sufficient level and revert impersonation cleanly after the operation. The FVE_E_TOKEN_NOT_IMPERSONATED request should then advance without removing an unrelated recovery route.
After reboot or remount	Recheck protection, conversion and lock state for FVE_E_TOKEN_NOT_IMPERSONATED; a successful management call is incomplete if the next boot cannot unlock the volume.

Verification after the change

For FVE_E_TOKEN_NOT_IMPERSONATED, success means more than the absence of a dialog. Confirm that the condition represented by FVE_E_TOKEN_NOT_IMPERSONATED 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_TOKEN_NOT_IMPERSONATED request advances to another HRESULT, record both values in order because that transition reveals the next unmet prerequisite.

Official references

Reference set for FVE_E_TOKEN_NOT_IMPERSONATED:

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