Outage in Microsoft 365
Users may have received no response when prompting Microsoft 365 Copilot Chat using the Claude Opus model
Resolved Minor
June 01, 2026 - Started 4 days ago
- Lasted 4 days
Incident Report
Summary AI Generated
Microsoft 365 Copilot Chat users experienced failures when using the Claude Opus model, receiving "We're experiencing high demand. Please try again later" errors instead of responses to their prompts. The issue was caused by increased request traffic that overwhelmed the infrastructure supporting Claude Opus responses, causing it to operate in a suboptimal state. Microsoft resolved the problem by applying configuration changes to rebalance the request traffic across their infrastructure.
Title: We're looking into a potential problem impacting Microsoft 365 Copilot Chat
User impact: We're checking for potential impact to your users.
Current status: We're investigating a potential issue impacting Microsoft 365 Copilot Chat and checking for impact to your organization. We'll provide an update within 30 minutes.
User impact: We're checking for potential impact to your users.
Current status: We're investigating a potential issue impacting Microsoft 365 Copilot Chat and checking for impact to your organization. We'll provide an update within 30 minutes.
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Latest Updates ( sorted recent to last )
about 20 hours ago - at 06/04/2026 10:16PM
Title: Users may receive no response when prompting Microsoft 365 Copilot Chat using the Claude Opus model
User impact: Users may receive no response when prompting 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 status: We've 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.
Start time: Monday, June 01, 2026, at 1:00 PM UTC
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
about 20 hours ago - at 06/04/2026 09:55PM
Title: Users may receive no response when prompting Microsoft 365 Copilot Chat using the Claude Opus model
User impact: Users may receive no response when prompting 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 status: We've identified that 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. We're evaluating our options to rebalance the request traffic and remediate the impact.
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 12:00 AM UTC
about 21 hours ago - at 06/04/2026 08:59PM
Title: Users may receive no response when prompting Microsoft 365 Copilot Chat using the Claude Opus model
User impact: Users may receive no response when prompting 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 status: We're reviewing provided HTTP Archive format (HAR) logs to gain clarity on the issue and determine the next steps to isolate the root cause.
Scope of impact: Any user prompting Copilot Chat using the Claude Opus model may be impacted.
Next update by: Thursday, June 04, 2026, at 10:00 PM UTC
about 21 hours ago - at 06/04/2026 08:41PM
Title: We're looking into a potential problem impacting Microsoft 365 Copilot Chat
User impact: We're checking for potential impact to your users.
Current status: We're investigating a potential issue impacting Microsoft 365 Copilot Chat and checking for impact to your organization. We'll provide an update within 30 minutes.
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