Hi @Amine Yahia
Welcome to Microsoft Q&A forum
To better understand, may I confirm whether the issue occur on Teams app or Teams for web?
Regarding your situation, I suggest you try some basic troubleshooting steps:
1.Clear Teams Cache:
-Close Microsoft Teams completely (right-click the Teams icon in the system tray and select "Quit").
-Press Windows + R, type %appdata%\Microsoft\Teams, and press Enter.
-Delete the contents of the Cache, blob_storage, databases, and temp folders (do not delete the folders themselves).
-Restart Teams and test a call to check if the issue persists.
2.Run Program Compatibility Troubleshooter:
-Right-click the Teams desktop icon and select "Troubleshoot compatibility."
-Choose "Try recommended settings" and follow the prompts.
-Test Teams after applying the settings. If the issue remains, run the troubleshooter again and select the second option to continue troubleshooting.
However, as many people in your organization are affected by this issue, Microsoft’s support team will need to step in. A technical support engineer can perform a remote session to investigate the situation, verify the backend configurations, and run any necessary synchronization tools to resolve the problem. If the issue requires further attention, they can escalate it to a specialized team for deeper analysis.
Please contact your 365 Global Admin to do:
-Submit a Service Request: The Global Admin should create a service request with Microsoft support to get advanced technical assistance and diagnostics. For detailed instructions on how to get support, please refer to Get support - Microsoft 365 admin.
-Find Your Microsoft 365 Admin: If you’re unsure who the Global Admin is within your organization, you can find guidance on locating them here: How do I find my Microsoft 365 admin? - Microsoft Support.
Additionally, to effectively escalate the Microsoft Teams blank screen issue to Microsoft Support, please collect Teams client diagnostic logs by following:
-Open Microsoft Teams.
-Press Ctrl + Alt + Shift + 1 (Windows) while Teams is running. This automatically generates and downloads a diagnostic log file to the user’s Downloads folder
-Collect logs from at least 3–5 affected users to show the issue’s scope.
(Visiting for more information: Collect log files for monitoring and troubleshooting in Teams - Microsoft Teams | Microsoft Learn )
Due to this issue affects more than 50+ users, I recommend you ask your Global Admin in your organization to report issue via Service Health in Microsoft 365 Admin Center
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