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Hi ada

To help narrow down the cause, please try the following:

• Does the issue also occur when you open Teams in an InPrivate/Incognito window?
• Does the same behavior occur if you sign in using a different supported browser?
• If the issue does not occur in an InPrivate/Incognito window, or only occurs in one browser, temporarily disable any browser extensions, especially ad blockers or privacy-related extensions, and test again.
• Ensure that your browser isn't blocking cookies for Microsoft websites, as this may interfere with the Teams sign-in process.
• Are you the only user in your organization experiencing this issue, or are other users seeing the same behavior?
• Do you have the Teams desktop application installed? If so, please try signing in there and let us know whether the same issue occurs.
• Are you connected to your organization's network or VPN (if required by your organization) when the issue occurs?

Based on Microsoft documentation, this behavior may be related to organization-specific network requirements. You may review the"Help prevent the issue" section in the following article for additional context: Restore your access to Microsoft Teams | Microsoft Support

Please understand that our initial reply may not always immediately resolve the issue. However, with your help and more detailed information, we can work together to find a solution.  

I look forward to your update.       

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