What does HRESULT 0x87C51045 (UTC_E_FILTER_MISSING_ATTRIBUTE) mean?

UTC_E_FILTER_MISSING_ATTRIBUTE

Map the code to the scenario graph: filter command attribute validation

UTC_E_FILTER_MISSING_ATTRIBUTE (0x87C51045) is a Universal Telemetry Client result from the scenario filter parser and evaluator layer for this HRESULT. A reliable investigation preserves the producing action before any cleanup runs for this HRESULT. Here the relevant owner is filter command attribute validation: a filter command omits a field required by that command grammar for this HRESULT. This is narrower than a generic failure of Connected User Experiences and Telemetry for this HRESULT.

UTC filters are typed programs, not plain text searches for this HRESULT. Parsing, command validation, name lookup, signature binding and evaluation are distinct phases for this HRESULT. Capturing the normalized expression and inferred operand types is essential for a useful diagnosis for this HRESULT. Record the configuration package or scenario generation together with the Windows build; otherwise a repaired file can be tested against a stale in-memory graph and appear to fail for the same reason for this HRESULT.

Data needed for triage

The AllStat message names the immediate condition as “Filter command is missing a required attribute” for this HRESULT. In practice, the useful extension is to ask whether the request was rejected before any side effect, after partial setup, or during cleanup for this HRESULT. Verify the existence and ownership of the expected output—session, directory, process, result object or emitted event—rather than assuming the message describes the final system state for this HRESULT.

Reproduce without collateral changes

1. Associate this result with one request, one scenario version and one service process ID for this HRESULT.
2. Save command name, supplied attributes, schema version, XML location and parser diagnostics and the first lower-level HRESULT if one exists for this HRESULT.
3. Change no policy, provider set or destination except for this test: add only the required attribute with a valid value and revalidate before replaying events for this HRESULT.
4. Compare the produced artifacts and operational events, not only the top-level return Value.

The most informative neighbor is UTC_E_FILTER_INVALID_COMMAND. The distinction is concrete: UTC_E_FILTER_INVALID_COMMAND means the command name or overall syntax is unrecognized for this HRESULT. Keeping both symbolic names in logs prevents a broad “DiagTrack error” bucket from hiding whether the failure occurred during parsing, authorization, resource acquisition, execution or teardown for this HRESULT.

Typed-filter note

Save the filter after variable substitution and type inference, not only the authoring XML for this HRESULT. With this result, a visually plausible expression can still fail because the runtime command table, scope or operand types differ from the authoring tool for this HRESULT. Test with one synthetic event whose fields and types are known exactly for this HRESULT.

Fix the contract

Fix the authoring source so every generated command carries its mandatory attributes for this HRESULT. Apply that change only to the owning boundary for this HRESULT. A successful repair must make the controlled case cross this boundary while retaining the intended policy, trace providers, destination and security context for this HRESULT.

Restarting Windows, clearing every ETL file or disabling diagnostic policy is not a justified first response to this result. Those actions destroy evidence and can change several independent UTC gates at once for this HRESULT.

• the same request now produces its documented success or nonfatal status without a second hidden retry
• the operational log shows one coherent request lifetime and no orphaned action, timer, process or trace session
• teardown followed by a second run does not reuse stale state or recreate filter command attribute validation
• the nearby condition remains distinguishable: UTC_E_FILTER_INVALID_COMMAND means the command name or overall syntax is unrecognized

Technical references

• Microsoft Open Specifications: Windows error-code registry — reference for scenario filter parser and evaluator while interpreting this result.
• Microsoft: Universal Telemetry Client configuration diagnosis — reference for scenario filter parser and evaluator while interpreting it.
• Microsoft: Windows Event Log query schema
• Microsoft: Querying Windows Event Log

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