Common Microsoft Teams sign in errors and how to fix

Microsoft Teams (part of Microsoft 365 offering) has emerged as a great meeting and collaboration tool, giving good competition to Zoom, WebEx, Google Meet. With increasing popularity and usage, there are also frequent complaints from customers about not being able to sign in and facing errors while using Teams. Some errors occur directly related to Teams and some with an integration like SharePoint, Power Automate, etc.

Here is a list of some common and frequent login errors with Microsoft Teams and how they can be fixed. For fixing some errors, you will need assistance from your organization's Microsoft 365 Tenant Admin.

Microsoft Teams common issues
Microsoft Teams common issues

Error Code Error Description Troubleshooting details


This error occurs when you use incorrect Microsoft 365 login credentials Ensure your account and password is correct to login to Mictosoft Teams. Sometimes the Windows and Microsoft 365 credentials may be different, please verify (take help from organization IT admin).


This error is related to authorization problems with Teams Ensure the system (desktop/laptop) Date and Time are set up correctly. Inaccurate date and time settings can affect your connections to https sites.


This error is related to time out requests Ensure that you are connected to the Internet and firewall configuration isn't blocking any access (take help from organization IT admin).


This error occurs when the server cannot be reached and resolved Ensure that you are connected to the Internet and firewall configuration isn't blocking any access (take help from organization IT admin).


This error occurs when your request needs approval or authorization to server Confirm that your organization is complying with Azure Active Directory (AAD) configuration policies (take help from organization IT admin).

Smart Card not working

This error occurs when the smart card PIN is not working Try re-inserting the smart card. If that does not help, the certificate might be corrupt, take help from organization IT admin.
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