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UTC_E_MISSING_AGGREGATE_EVENT_TAG
Identify the owning component: aggregation/privacy event tagging
When UTC_E_MISSING_AGGREGATE_EVENT_TAG (0x87C51042) is returned, the producing layer is TraceLogging aggregation metadata. Correlate this HRESULT with the exact request attempt that returned it. The rejected object or state is aggregation/privacy event tagging, and the specific condition is that an event carries an aggregation or differential-privacy payload but lacks the required aggregate event tag. Keep this first HRESULT even if a later service call reports another error.
TraceLogging events can carry tags and structured diagnostic fields that consumers interpret according to producer-defined semantics. Aggregation metadata must be internally consistent at emission time; a downstream collector should not guess a missing tag or schema.
What to capture before retrying
| UTC diagnostic field | Value |
|---|---|
| Owning state or object | aggregation/privacy event tagging |
| Producing layer | TraceLogging aggregation metadata |
| Do not confuse with | UTC_E_INVALID_AGGREGATION_STRUCT means a tag may be present but the structure itself is invalid |
| Evidence to collect | provider/event name, TraceLogging tag, event metadata, payload schema and producer build |
| Narrow comparison | emit the same structure with the required compile-time event tag and inspect TRACE_EVENT_INFO.Tags |
Prove the condition
- Associate this result with one request, one scenario version and one service process ID.
- Save provider/event name, TraceLogging tag, event metadata, payload schema and producer build and the first lower-level HRESULT if one exists.
- Change no policy, provider set or destination except for this test: emit the same structure with the required compile-time event tag and inspect TRACE_EVENT_INFO.Tags.
- Compare the produced artifacts and operational events, not only the top-level return value.
Nearby result: UTC_E_INVALID_AGGREGATION_STRUCT — means a tag may be present but the structure itself is invalid.
Producer-side validation
Inspect the emitted event metadata before ingestion. Event tags and field layouts are serialized by the producer; correcting a dashboard or post-processing query cannot repair malformed wire metadata.
Confirm the repair
Fix producer instrumentation so tag and aggregate structure are emitted together.
Technical references
- Microsoft Open Specifications: Windows error-code registry — reference for TraceLogging aggregation metadata while interpreting this result.
- Microsoft: TraceLoggingEventTag — reference for TraceLogging aggregation metadata while interpreting this result.
- Microsoft: About TraceLogging — reference for TraceLogging aggregation metadata while interpreting it.
- Microsoft: Diagnostic data record structure
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