When you upload a file to a Microsoft Teams private channel, Microsoft Defender for Office 365 may quarantine it. This happens because private channel files are stored in a separate SharePoint site that inherits a default data loss prevention policy. The result is a blocked file that users cannot open or share. This article explains … Read more
When you share a file in a Teams guest conversation, Microsoft Defender for Office 365 may quarantine it. The file becomes unavailable, and both you and the guest see an error. This happens because Defender scans files shared in external or guest contexts with stricter policies. This article explains why Defender quarantines files in guest … Read more
You see a notification that a file you shared or uploaded in Teams has been quarantined by Microsoft Defender for Endpoint after your organization changed a compliance policy. The file is blocked from viewing, downloading, or sharing, which interrupts your team’s work. This happens because the new policy applies stricter threat detection rules, and Defender … Read more
When you upload a file to a Teams channel or chat, Microsoft Defender for Microsoft 365 may quarantine it if it detects malicious content. You see a message in the Teams admin center stating the file is quarantined, and users cannot open or download it. This happens because Defender scans all files shared in Teams … Read more
When you record a Teams meeting, the recording is saved as an MP4 file. Sometimes Microsoft Defender for Endpoint flags that file as a threat and quarantines it. You see an error that the file is quarantined, and you cannot open or recover the recording. This happens because Defender scans the file and falsely detects … Read more
Your Teams retention policy is configured but messages remain in chats and channels long after the deletion period. This happens because Teams retention policies only apply to messages that meet specific conditions, and several settings can block deletion entirely. This article explains why retention policies fail and shows you how to verify and fix the … Read more
If you set a Teams retention policy to delete chat messages after a certain period, but messages from a recorded meeting remain in the chat history, the policy may not be applying correctly. This happens because recorded meetings generate transcript and recording files that are governed by separate retention settings. This article explains the technical … Read more
When a data loss prevention policy fails to block a message in a private channel, users can send sensitive content without warning. This usually happens because the policy scope does not include private channels. Microsoft Teams applies DLP policies to standard channels by default, but private channels require explicit configuration. This article explains the root … Read more
When a Microsoft Teams data loss prevention policy does not block a message in a conversation that includes a guest, the policy is often configured to exclude external or guest users. This article explains why DLP policies can miss guest conversations and provides step-by-step fixes to ensure your sensitive data stays protected. You will learn … Read more
When you update a Data Loss Prevention policy in Microsoft Purview, you expect Teams to block sensitive messages immediately. Instead, some messages slip through, and users can send credit card numbers or confidential data without any warning. This delay or failure usually happens because the policy change has not propagated to Teams, or because the … Read more