Table of Contents
Summary
- Users with Microsoft Defender for Office 365 Plan 1 can report suspicious Teams messages for the first time.
- Reporting options include marking messages as security risks or not security risks (false positives).
- Reports will be accessible in the Defender portal and configured mailboxes.
- Teams admin center reporting features will be enabled automatically with existing user reporting settings.
- Preparation steps include enabling user reporting settings and communicating guidance to users.
Admin Impact: Low
User Impact: Medium
Release Start: 15 Feb 2026
Release End: 15 Feb 2026
Services: Defender XDR, Teams
Category: Stay informed
Tags: New Feature, User Adoption, Admin Action
History
1/21/2026 Item Added to Message Center
Microsoft Message
Introduction
We’re expanding the ability for users to report suspicious Microsoft Teams messages to customers with Microsoft Defender for Office 365 Plan 1. Previously available only to Plan 2, this update helps security teams identify and investigate potential phishing, malware, and spam across internal and external Teams chats, channels, and meeting chats. This enhancement strengthens protection by incorporating user-reported signals into existing Defender detections.
Users will be able to report messages in two ways:
- Report as security risk — for messages suspected to contain phishing, malware, or other malicious content.
- Report as not a security risk — for messages that were incorrectly identified as threats (false positives).
This message is associated with Microsoft 365 Roadmap ID 531760.
When this will happen
General Availability (Worldwide): Rollout begins in mid-February 2026 and is expected to complete in mid-February 2026.
How this affects your organization
Who is affected:
- Microsoft 365 tenants using Microsoft Defender for Office 365 Plan 1
- Users across Microsoft Teams
- Security admins reviewing reported messages
What will happen:
- Users will see options to report messages as security risks or not security risks.
- Reports will appear on the User reported page in the Defender portal and/or your configured mailbox.
- This feature is opt-in and respects your existing User reported settings.
- Teams admin center toggles for reporting will be automatically enabled when User reported settings are turned on.
What you can do to prepare
- Enable and configure User reported settings in the Defender portal.
- Review message reported destination preferences for reported messages.
- Communicate reporting guidance to users.
- Review supporting documentation.
- Update internal documentation as needed.
Learn more:
- How your submissions to Defender for Office 365 are processed behind-the-scenes | Microsoft Defender for Office 365 Blog
- Turn off or turn on user reporting of Teams messages in the Defender portal | Microsoft Learn
- User reported message settings in Microsoft Teams | Microsoft Defender for Office 365 | Microsoft Learn
Compliance considerations
No compliance considerations identified. Review as appropriate for your organization.