What does HRESULT 0x87C51031 (UTC_E_TIME_TRIGGER_ONLY_VALID_ON_SINGLE_TRANSITION) mean?

UTC_E_TIME_TRIGGER_ONLY_VALID_ON_SINGLE_TRANSITION

Locate the rejected contract: time-trigger ownership

UTC_E_TIME_TRIGGER_ONLY_VALID_ON_SINGLE_TRANSITION (0x87C51031) is a Universal Telemetry Client result from the scenario state-machine trigger validation layer for this HRESULT. The symbolic name points to a narrow UTC contract that can be tested directly for this HRESULT. Here the relevant owner is time-trigger ownership: one time trigger instance is referenced by more than one transition, making its timer/state ownership ambiguous for this HRESULT. This is narrower than a generic failure of Connected User Experiences and Telemetry for this HRESULT.

Time, event and forwarded triggers participate in a scenario state machine for this HRESULT. Their type, ownership, source state and transition cardinality are configuration contracts; changing the observed event cannot repair an invalid graph 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.

Capture checklist

The AllStat message names the immediate condition as “Time triggers can only be attached to a single transition” 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.

Comparison with a passing case

1. Export the relevant Microsoft-Windows-UniversalTelemetryClient/Operational events and preserve their ActivityId or request correlation alongside this result.
2. Capture trigger ID, all referencing transitions, source states, durations and graph serialization for this HRESULT. Do this before restarting the service or deleting any working directory for this HRESULT.
3. Perform this one-variable comparison: clone the trigger so each transition owns a distinct timer and compare behavior for this HRESULT.
4. After the comparison, record the next HRESULT and whether the requested session, action, trigger or output object was actually created for this HRESULT.

The most informative neighbor is UTC_E_MULTIPLE_TIME_TRIGGER_ON_SINGLE_STATE. The distinction is concrete: UTC_E_MULTIPLE_TIME_TRIGGER_ON_SINGLE_STATE concerns multiple timers attached within one state 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.

Platform-state note

Capture capability and identity state at the moment this result is returned. Session, container, service and destination state can change asynchronously, so a later successful query does not describe the failed generation for this HRESULT.

Resolution and regression test

Author one timer per transition and preserve independent cancellation when a state exits 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 time-trigger ownership
• the nearby condition remains distinguishable: UTC_E_MULTIPLE_TIME_TRIGGER_ON_SINGLE_STATE concerns multiple timers attached within one state

Technical references

• Microsoft Open Specifications: Windows error-code registry — reference for scenario state-machine trigger validation while interpreting this result.
• Microsoft: Universal Telemetry Client configuration diagnosis — reference for scenario state-machine trigger validation while interpreting it.
• Microsoft: Querying Windows Event Log
• Microsoft: Windows Performance Recorder

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