copilot_chat fails with "Connector request failed" for meeting transcript queries in Copilot Studio

[joestamper]

Summary

copilot_chat consistently returns "Connector request failed"
(reasonCode: RequestFailure) for meeting transcript extraction queries
in Copilot Studio, while simple calendar queries succeed on the same
agent with the same connector.

Environment

• Platform: Copilot Studio (agent with Work IQ Copilot Preview
  connector)
• User: Microsoft FTE
• Date: April 21, 2026

Behavior

Simple queries work:

• "What meetings did I have yesterday?" → succeeds in ~27s, returns
  correct data

Transcript content queries fail:

• Any query asking for detailed meeting content → fails at ~60s

Tested Approaches (all failed)

Approach	Result
Single comprehensive query	Timeout at 60s
4 parallel copilot_chat queries	3/4 fail, 1 succeeds
4 sequential queries (one at a time)	Connector request failure
Single shorter query (~50 words)	Connector request failure

The same questions work instantly when asked directly in M365 Copilot
in Teams.

Error Details

From Copilot Studio trace:

reasonCode: RequestFailure errorMessage: Connector request failed
dialogSchemaName: auto_agent_zjtsS.topic.WorkIQCopilotPreview

Impact

Blocking production deployment of a meeting recap agent. The agent
needs to extract action items, metrics, and blockers from Teams meeting
transcripts. copilot_chat is the only available path — Graph API
transcript access (OnlineMeetingTranscript.Read.All) requires admin
consent we don't have.

Possibly Related

• System Error when prompting Copilot Studio Agent and invoking a WorkIQ MCP tool #89 — Same connector, same class of failure