HRESULT 0x803100D9 (FVE_E_OSV_KSR_NOT

Status / error code:

Category:

Constant name:

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Facility:

Operating System:

Description:

BitLocker Drive Encryption policy does not allow KSR operation with protected OS volume.

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FVE_E_PROTECTION_CANNOT_BE_DISABLED	FWP_E_CALLOUT_NOT_FOUND

FVE_E_OSV_KSR_NOT_ALLOWED

Read this as a state-machine result

FVE_E_OSV_KSR_NOT_ALLOWED is a BitLocker facility HRESULT, not a Win32 filesystem error wrapped by an application. In this case policy forbids the requested Key Storage Root operation while the operating-system volume remains protected.

For FVE_E_OSV_KSR_NOT_ALLOWED, 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_OSV_KSR_NOT_ALLOWED, remember: A policy HRESULT therefore describes a rejected configuration decision, not evidence that encrypted sectors are damaged.

What the code does not prove

The closest misleading interpretation is a generic unsupported capability; the operation is recognized but incompatible with protected OS-volume policy. For FVE_E_OSV_KSR_NOT_ALLOWED, verify the returning method and state transition before assigning the incident to disk corruption, TPM failure or bad credentials.

Inspect the target, not just the message

For FVE_E_OSV_KSR_NOT_ALLOWED, record KSR operation type, OS-volume protection and protector state, effective policy, caller context and maintenance objective. For FVE_E_OSV_KSR_NOT_ALLOWED, keep the full HRESULT and the first method that returned it because later cleanup calls can report a different state.
For FVE_E_OSV_KSR_NOT_ALLOWED, 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_OSV_KSR_NOT_ALLOWED failure and note the boot session, caller identity and management source; that evidence separates this BitLocker condition from a generic access or storage error.

For FVE_E_OSV_KSR_NOT_ALLOWED, note: A managed restriction is part of the security design. When diagnosing FVE_E_OSV_KSR_NOT_ALLOWED, remember: Record which authority delivered it and whether the requested operation is mandatory for compliance or merely a convenience feature.

A low-risk recovery path

For FVE_E_OSV_KSR_NOT_ALLOWED, use the documented policy-approved key-management workflow and avoid disabling protection solely to bypass the restriction.
After correcting the FVE_E_OSV_KSR_NOT_ALLOWED prerequisite, refresh protection, conversion and lock state before one controlled retry; a cached UI message is not proof that the FVE_E_OSV_KSR_NOT_ALLOWED condition is still active.
Before a FVE_E_OSV_KSR_NOT_ALLOWED 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

Result interpretation for FVE_E_OSV_KSR_NOT_ALLOWED

After correction, compare the new conversion, protection and lock state with the original snapshot. A different HRESULT after FVE_E_OSV_KSR_NOT_ALLOWED is useful because it means the request crossed this boundary and reached the next prerequisite.

State checks specific to FVE_E_OSV_KSR_NOT_ALLOWED

Checkpoint	How to interpret it for FVE_E_OSV_KSR_NOT_ALLOWED
Before the call	Record the target identity and the pre-call policy and authorization state. For FVE_E_OSV_KSR_NOT_ALLOWED, the decisive boundary is that policy forbids the requested Key Storage Root operation while the operating-system volume remains protected.
At failure	Preserve KSR operation type, OS-volume protection and protector state, effective policy, caller context and maintenance objective. This proves whether FVE_E_OSV_KSR_NOT_ALLOWED came from BitLocker itself or from a wrapper translating another result.
After correction	Use the documented policy-approved key-management workflow and avoid disabling protection solely to bypass the restriction. The FVE_E_OSV_KSR_NOT_ALLOWED request should then advance without removing an unrelated recovery route.
After reboot or remount	Recheck protection, conversion and lock state for FVE_E_OSV_KSR_NOT_ALLOWED; a successful management call is incomplete if the next boot cannot unlock the volume.

Verification after the change

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

References

Reference set for FVE_E_OSV_KSR_NOT_ALLOWED:

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