Microsoft 365

Title: Potential issues accessing mailboxes via one or more connection methods User impact: Users may experience errors or failures when accessing their mailbox via one or more Exchange Online connection methods. Current status: We're investigating a potential issue and checking for impact to your organization. We'll provide an update within 60 minutes.

Title: Users may be unable to join Microsoft Teams live events using the iOS mobile app User impact: Users may be unable to join Microsoft Teams live events using the iOS mobile app. More info: While we're working to remediate impact, affected users can join Teams Live Events using the Microsoft Teams Android, desktop, or web clients. Current status: We're investigating a potential issue with Microsoft Teams and checking for impact to your organization. We'll provide an update within 30 minutes.

Title: Users may be unable to access Microsoft Copilot Chat in the browser and may encounter a 400 Request Header error User impact: Users may be unable to access Microsoft Copilot Chat in the browser and may encounter a 400 Request Header error. More info: As a temporary workaround, affected users may be able to restore access to Microsoft Copilot Chat by clearing their browser cookies and then trying again. Current status: We're reviewing service monitoring telemetry to isolate the source of the issue and establish a fix. Scope of impact: Impact is specific to some users attempting to access Microsoft Copilot Chat in the browser.

Title: Some users may be unable to create or publish Microsoft Teams town hall or webinar events that include guest users User impact: Users may be unable to create or publish Microsoft Teams town hall or webinar events that include guest users. Current status: We're reviewing service monitoring telemetry to isolate the source of the issue and establish a fix. Scope of impact: Impact is specific to some users attempting to create or publish Microsoft Teams town hall or webinar events that include guest users. Next update by: Wednesday, July 29, 2026, at 9:30 AM UTC

Title: We're investigating a potential issue with Microsoft Teams User impact: Users are reporting issues joining Microsoft Teams meetings. Current status: We're investigating a potential issue which is preventing users from joining Microsoft Teams meetings and/or is causing disconnections, and we're checking for impact to your organization. We'll provide an update within 30 minutes.

Title: Investigating user reports of Microsoft 365 issues User impact: We don't have detail on impact yet. We're seeing an increase in user reported issues above our alerting threshold. Current status: We are reviewing service telemetry and available information to determine if there is an issue happening and we'll update this message shortly with our latest findings. This communication serves as a preliminary notification about a potential issue affecting your service. We'll provide an update in 30 minutes.

Title: Potential issues accessing mailboxes via one or more connection methods User impact: Users may experience errors or failures when accessing their mailbox via one or more Exchange Online connection methods. Current status: We're investigating a potential issue and checking for impact to your organization. We'll provide an update within 60 minutes.