If you see an error message when you try to sign in to Microsoft Teams, the status code at the bottom left corner of the window can help your IT admin diagnose what went wrong with your sign-in process. In many cases, only your IT admin or sysadmin will be able to resolve sign-in issues for you. So make a note of your status code and send it to them.
Curious about what your status code means, or want to try basic troubleshoot procedures? Look it up in the table below.
: If you don't see your status code in the table below, and can’t solve the issue you’re having, contact your IT admin with the status code.
Known issues
|
Status Code |
Description |
Troubleshooting action |
|
0xCAA20003 |
You ran into an authorization problem. |
Make sure your date and time are set up correctly. If your date and time are incorrect, you won't be able to connect to secure sites (https). |
|
0xCAA20004 |
Your request needs to be approved by a resource owner or authorization server. |
Contact your IT admin so they can confirm that your organization is complying with Microsoft Entra ID configuration policies. |
|
0xCAA70004 |
The server or proxy wasn't found. Usually it’s because a proxy is misconfigured or a network sniffing program like Fiddler is running but hasn’t been configured to decrypt HTTPS traffic. |
Contact your IT admin so they can stop the program and relaunch the app or configure it properly and relaunch it. |
|
0xCAA70007 |
The download has failed because the connection was interrupted. |
Make sure that you're connected to the Internet. Then work with your IT admin to ensure that other apps or a firewall configuration aren't preventing access. |
|
0xCAA82EE2 |
The request has timed out. |
Make sure that you're connected to the Internet. Then work with your IT admin to ensure that other apps or a firewall configuration aren't preventing access. |
|
0xCAA82EE7 |
The server name couldn't be resolved. |
Make sure that you're connected to the Internet. Then work with your IT admin to ensure that other apps or a firewall configuration aren't preventing access. |
|
0xCAA90018 |
You’re not using the right credentials. |
The Windows credentials you signed in with are different than your Microsoft 365 credentials. Try to sign in again with the correct email/ password combination. If you're still getting this status code, contact your IT admin. |
|
none |
You’ll need to re-enter your PIN using a smart card. |
Re-insert your smart card. Also, your smart card certificate might be corrupt, in which case, contact your IT admin. |
Here are a few FAQs about this:
Why can't I sign in?
Every organization that uses Microsoft Teams already has modern authentication, and Teams should be able to recognize that your credentials are linked to your Office 365 account. If you can't complete the sign-in process, there might be something wrong with your domain or your company's Office 365 account. Your IT admin or sysadmin will be able to help, so get in touch with them for more info and next steps.
What is modern authentication?
Modern authentication is a secure and reliable way to sign in.
It includes single sign-on, or SSO, which is a process that makes it possible for you to sign in without having to re-enter your email and password every time you want to use Teams.
Signing in with modern authentication varies depending on if you're working in Windows or on a Mac, or whether your company has enabled single-factor authorization or multi-factor authorization. Multi-factor authentication usually involves verifying your credentials via your phone, by providing a unique code or entering a PIN number or presenting your thumbprint.
Either way, once you complete the sign-in process using modern authentication, you won’t have to provide your credentials again, as long as you’re using the same laptop, desktop, or other device.
Reference
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For more info on access to Microsoft Teams, see How do I get access to Microsoft Teams.
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If you’re an IT admin and want more detailed info about how to resolve a sign-in problem, see Identity models and authentication in Microsoft Teams
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Microsoft Entra authentication and authorization error codes
