Users may have been unable to join some Microsoft Teams meetings through the "Join" button in the meeting chat

Question

We are currently experiencing issues with Microsoft Teams. Multiple users are unable to join Teams calls. The issue occurs on both the web version and the desktop application, showing different network-related errors. We have tested across multiple networks and are experiencing the same behavior.

Could you please confirm if there is any ongoing outage?

Answer 1

Hi @Mr Sonbir,  

Welcome to the Microsoft Q&A forum.  

Thank you very much for reaching out regarding the issue where multiple users are unable to join Microsoft Teams meetings. I truly appreciate the details you shared and fully understand how impactful this disruption can be to your team’s operations. 

The wide impact across users, devices, and platforms suggests the issue likely stems from higher‑level service factors such as Microsoft’s service‑side connectivity or routing problems, regional performance degradation, or backend infrastructure disruptions affecting signaling or media flows rather than any isolated user or local network condition. 

Here are my recommendations, please follow the steps below: 

1/ Recommended workarounds 

In the meantime, here are my recommended workarounds, which I hope will be helpful to you: 

• Temporarily disable VPN, proxy, or SSL inspection, as these can interfere with Teams’ real‑time media or service endpoints. 
• Ensure your network allows required Teams endpoints and media ports (UDP 3478-3481) to support successful meeting join and audio/video negotiation. 
• If available for your tenant, users may join via Audio Conferencing (dial‑in numbers) as a fallback option. 
• Meeting organizers may also enable Phone audio within meeting options for participants experiencing media issues. 

For additional information, you can refer to this article: Troubleshoot connectivity issues with Teams client - Microsoft Teams | Microsoft Learn 

2/ Contact Support 

Because the problem affects multiple users, across different networks, and on both Teams web and desktop clients, this strongly suggests the cause may lie beyond end‑user devices or local network conditions.  

Given this situation, I strongly recommend reaching out to your IT department and asking them to open a support ticket with Microsoft Support through the Microsoft 365 Admin Center. They have access to tenant‑specific backend telemetry, internal service logs with correlation tools, regional health diagnostics, and full incident‑level investigation capabilities. 

Once you submit a case, a live Microsoft support agent will reach out to review the situation, analyze backend data, and determine if your tenant is affected by an ongoing service‑side event. This is the most reliable way to identify and resolve issues that are not visible from the client side or through basic network checks. 

We kindly ask for your understanding that, as moderators, we do not have access to the administrative tools or permissions required to investigate or modify these configurations. We also do not have the capability to initiate remote sessions for direct assistance. Our role is to guide users to the appropriate resources and support channels.     

I hope this information is helpful. Should you have any further questions or need additional assistance, feel free to reach out.   

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