Microsoft 365 Alert – Service Degradation – Microsoft 365 Copilot Chat – Users may receive no response when prompting Microsoft 365 Copilot Chat using the Claude Opus model – ONGOING

05/06/2026 08:35:00 AM

NHSmail Reference: INC46843652

Microsoft Reference: CW1352001

Issue Status: ONGOING

Issue Description: Users may receive no response when prompting Microsoft 365 Copilot Chat using the Claude Opus model.

More info: When users attempt to prompt Copilot Chat using the Claude Opus model, they may receive an error that states, “We’re experiencing high demand. Please try again later.”

Current Update: 05/06/2026 08:35:00 AM  – Microsoft has applied configuration changes to rebalance the request traffic and are monitoring our service health telemetry to confirm whether the impact is remediated.

Scope of impact: Any user prompting Copilot Chat using the Claude Opus model may be impacted.

Root cause: An increase in request traffic is causing the portion of infrastructure responsible for facilitating the responses to prompts using Claude Opus in Copilot Chat to operate in a suboptimal state.

Next update by: Friday, June 05, 2026, at 6:30 PM UTC