Some users may be unable to access or receive prompt responses with Microsoft 365 Copilot Chat or Copilot Notebooks

Title: Some users may be unable to access or receive prompt responses with Microsoft 365 Copilot Chat or Copilot Notebooks User impact: Users may have been unable to access or receive prompt responses with Copilot Chat or Copilot Notebooks. More info: Users may have experienced failing requests for the following scenarios: - Image generation requests in Copilot Chat - Prompt generation requests in Copilot Chat - Failures when attempting to access or view Copilot Notebooks Final status: We've completed deployment of our code change to address a licensing mismatch in the request flow. After completing an internal monitoring period, we've validated that impact is remediated. Scope of impact: This incident impacted some users attempting to generate images or prompts using Copilot Chat or accessing Copilot Notebooks. Start time: Tuesday, September 22, 2026, at 2:50 AM UTC End time: Sunday, September 27, 2026, at 6:18 PM UTC Root cause: A licensing mismatch in the request flow was causing Copilot to view affected users as unlicensed, preventing them from completing requests or accessing Notebooks. Next steps: - We're analyzing the problematic request flow to isolate how the licensing mismatch was introduced into our service and to validate what actions we can take to prevent similar impact scenarios from occurring in the future. This is the final update for the event.

Title: Some users may be unable to access or receive prompt responses with Microsoft 365 Copilot Chat or Copilot Notebooks User impact: Users may be unable to access or receive prompt responses with Copilot Chat or Copilot Notebooks. More info: Users may experience failing requests for the following scenarios: - Image generation requests in Copilot Chat - Prompt generation requests in Copilot Chat - Failures when attempting to access or view Copilot Notebooks Current status: We've confirmed that the first change needed to allow us to fully remediate this issue has been validated and is in the process of being deployed. We're expediting the creation and deployment of additional changes needed, and anticipate that users will experience progressive relief by Wednesday, September 30, 2026. Scope of impact: This incident impacts some users attempting to generate images or prompts using Copilot Chat or accessing Copilot notebooks. This section may be updated as the investigation progresses. Estimated time to resolve: Users are expected to be able to access and receive prompt responses when accessing Copilot directly by Wednesday, September 30, 2026. We're finalizing our ETA for the remaining change to OneNote Copilot functionalities, which will require an additional change. Root cause: A licensing mismatch in the request flow is causing Copilot to view affected users as unlicensed, preventing them from completing requests or accessing Notebooks. Next update by: Monday, September 28, 2026, at 10:00 PM UTC

Title: Some users may be unable to access or receive prompt responses with Microsoft 365 Copilot Chat or Copilot Notebooks User impact: Users may be unable to access or receive prompt responses with Copilot Chat or Copilot Notebooks. More info: Users may experience failing requests for the following scenarios: - Image generation requests in Copilot Chat - Prompt generation requests in Copilot Chat - Failures when attempting to access or view Copilot Notebooks Current status: We've developed a fix that we expect will resolve the issue and are validating its efficacy before proceeding with deployment. We'll provide a timeline for the deployment as one becomes available. Scope of impact: This incident impacts some users attempting to generate images or prompts using Copilot Chat or accessing Copilot notebooks. This section may be updated as the investigation progresses. Root cause: A licensing mismatch in the request flow is causing Copilot to view affected users as unlicensed, preventing them from completing requests or accessing Notebooks. Next update by: Friday, September 25, 2026, at 6:30 PM UTC

Title: Some users may be unable to access or receive prompt responses with Microsoft 365 Copilot Chat or Copilot Notebooks User impact: Users may be unable to access or receive prompt responses with Copilot Chat or Copilot Notebooks. More info: Users may experience failing requests for the following scenarios: - Image generation requests in Copilot Chat - Prompt generation requests in Copilot Chat - Failures when attempting to access or view Copilot Notebooks Current status: We've received reports from a subset of affected users who have reported impact to prompt and image generation in Copilot Chat, as well as failures when accessing Copilot Notebooks. We've isolated that impact is caused by a licensing mismatch which is causing Copilot Chat to view affected users as unlicensed, preventing them from completing requests or accessing Notebooks. We're developing a fix to remediate the discrepancy, and we aim to provide more details on our fix and a timeline to release in our next scheduled update. Scope of impact: This incident impacts some users attempting to generate images or prompts using Copilot Chat or accessing Copilot notebooks. This section may be updated as the investigation progresses. Root cause: A licensing mismatch is causing Copilot to view affected users as unlicensed, preventing them from completing requests or accessing Notebooks. Next update by: Thursday, September 24, 2026, at 9:00 PM UTC