What does HRESULT 0x80042307 (VSS_E_PROVIDER_IN_USE) mean?

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The VSS provider is currently in use. It cannot be unregistered until work finishes.

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VSS_E_PROVIDER_VETO	VSS_E_OBJECT_NOT_FOUND

VSS_E_PROVIDER_IN_USE

VSS_E_PROVIDER_IN_USE means that the requested provider is currently participating in VSS work and cannot be unregistered safely. Removing it during an active snapshot operation could leave a requester or provider workflow incomplete.

What to do for VSS_E_PROVIDER_IN_USE

Wait for active backup, restore, import, or snapshot operations to finish or be cancelled cleanly.
Identify processes using VSS and schedule provider maintenance in a maintenance window.
Use the provider vendor's documented uninstall or upgrade workflow rather than deleting registrations manually.

Microsoft: VSS providers

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