What does HRESULT 0x8004230C (VSS_E_VOLUME_NOT_SUPPORTED) mean?

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No VSS provider supports the requested volume. Check storage and snapshot compatibility.

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VSS_E_OBJECT_NOT_FOUND	VSS_E_OBJECT_ALREADY_EXISTS

VSS_E_VOLUME_NOT_SUPPORTED

VSS_E_VOLUME_NOT_SUPPORTED means that no provider selected by VSS supports the requested volume or remote file share. It differs from a provider-specific error: here VSS could not find any suitable provider when the default selection was requested.

How to investigate for VSS_E_VOLUME_NOT_SUPPORTED

Confirm that the requested volume or share is eligible for the required snapshot context.
List registered providers and determine which provider supports the storage configuration.
For persistent system-provider snapshots, verify the NTFS and shadow-storage prerequisites.

Microsoft: AddToSnapshotSet return values

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