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Tested hypothesis (1) from the plan: add RTag2(CM_EVENT tag id) to the priming chain before AddNonStreamValuesBegin2. Result: - RTag2 itself succeeds: returns 25-byte response (01000000000100000001EE39C30EDCDC010100000000000000), no error buffer. - But AddNonStreamValuesBegin2 still fails with the same 04 33 00 00 00 (UnknownClient = 51) for all four handle formats. So RTag2 on /Hist isn't the cross-service registration trigger we need for /Trx. Plan doc updated with the result + next-session ordered probes (try IStorageServiceContract, then IL walk CClientCommon, then server-side decompile as last resort). Probe orchestrator now also performs the RTag2 step so the test gives one-shot diagnostic visibility of both calls. 178/178 tests pass. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>