Microsoft says some users can’t open the Teams desktop client
Description
Microsoft has acknowledged a known issue affecting some users on Windows systems who experience delays or are blocked from opening the Microsoft Teams desktop client. The problem causes loading delays of up to two minutes or failure to open the client initially. Microsoft is investigating the root cause and has advised affected users to use Teams via web or mobile apps as a workaround. A related issue affecting Mac users' ability to join Teams calls and meetings is also under investigation. No evidence of exploitation or security breach has been reported. Microsoft is actively working on remediation.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
A known issue (tracked as TM1466820) causes some Windows users to experience delays or inability to open the Microsoft Teams desktop client, with loading delays up to two minutes. Microsoft has acknowledged the problem and is analyzing logs and telemetry to identify the root cause. Affected users are advised to use Teams web or mobile clients as a workaround. Separately, an issue affecting Mac users joining Teams calls (TM1466659) is also under investigation. Microsoft has not confirmed any security vulnerability or exploit related to these issues and is focused on remediation.
Potential Impact
Users on Windows systems may be unable to open the Microsoft Teams desktop client or face significant loading delays, impacting productivity. Mac users may be unable to join Teams calls or meetings. There is no indication of a security breach or exploitation. The impact is limited to service availability and user access to the Teams desktop client.
Defensive Guidance
Microsoft advises affected users to access Microsoft Teams via the web or mobile applications as a workaround while the issue is being investigated and resolved. No security patch is currently indicated. Users should monitor official Microsoft communications for updates on remediation.
Technical Details
- Classification
- {"confidence":0.3,"severitySource":"default","classifier":"rss-v2"}
Threat ID: 6a9c420cacd9273b491aedb2
Added to database: 09/05/2026, 16:23:40 UTC
Last enriched: 09/07/2026, 10:53:23 UTC
Last updated: 10/04/2026, 06:18:11 UTC
Views: 91
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.