Fix Microsoft Teams Error Code CAA20002 [Connect to Server]

Written By Steven Arends

Starting your work day with an attempt to sign in to Microsoft Teams and out of nowhere, something went wrong error code CAA20002 appears, right?

Well, it’s a clear indication that your app cannot connect to the remote server.

In this article, I will walk you through the complete process to fix this issue permanently.


Let’s dive right in.

How to Fix Microsoft Teams Error Code CAA20002

To fix Microsoft Teams error CAA20002, clear the Teams cache and Enable TLS 1.2 from the internet options. If the issue persists, add the Teams account on Windows Account Manager, reinstall the app and stop using VPN. Sometimes changing the Teams password can fix the issue.

I’ve explained the detailed ways to fix below; take your time and have a glance.

Here are the methods to fix Microsoft Teams error CAA20002:

1. Clear Teams Cache

Clearing the cache files of the Teams app can solve the error CAA20002.

It’ll clear up previous temporary info about your log-in sessions and reduce junk. This is a simple yet powerful method to fix our issue or other complicated issues like Microsoft Teams form authentication failure.

Close the application completely before you jump ahead and clean the cache.

Here is the process to remove the Teams app cache:

  • Press Ctrl+Shift+Esc to open Task Manager.
  • Search the process of Microsoft Teams and right-click on it.
  • Choose End
  • Press Win+R on your keyboard to open the Run Program.
  • Type the following inside the box: %appdata%\Microsoft\teams.
  • Press Enter key.
  • Delete cache, blob_storage, Cache, databases, GPUcache, IndexedDB, Local Storage, and tmp folders.cache-folders-teams

Now, open MS Teams again and check if the solution worked.

2. Use TLS 1.2 from Internet Options

The next most practical and accurate fix for this issue is to activate TLS 1.2 on your computer. It fixes different connection issues you’re experiencing on the Teams app.

Here’s how to activate TLS 1.2 to fix the MS Teams CAA20002 error:

  • Search for Control Panel and open
  • Set the View mode to Large icons.
  • Click on Internet Options.internet-options
  • Switch to the Advanced tab.
  • Scroll down and check the box left to Use TLS 1.2 under security.enable-tls
  • Uncheck 1.0 and 1.1.

Apply the settings and restart your PC. Try signing in to Teams, and it should work flawlessly this time.

3. Add MS Teams Account in Windows

Adding the Teams work account in your Windows account manager solves this infamous server issue.

Here are the steps to add MS Teams account on Windows:

  • Click on the Windows Start icon on the taskbar.
  • Click on
  • Go to Accounts and select Access work or school.
  • ms-teams-add-windowsClick on the Connect button to add the account.

If it’s already there, disconnect, and reconnect it again. On the next attempt, you should be able to resolve the issue and thus login to your user account on MS Teams.

4. Change the Teams Account Password

In some cases, changing the password of the MS Teams account solves application sign-in problems. It reinstates your account status as an authorized one in the Teams’ database.

Here is the procedure to change MS Teams password:

  • Go to Microsoft’s website.
  • Sign in using your credentials, same as MS Teams.
  • Go to Security from the top navigation bar.
  • Head over to Password Security and select Change my
  • Enter your Current Password, then the new
  • Click Save.

Now, open the app on your device, and log in using the new password.

If you, however, fail to provide the correct password, it may throw a different error core, such as caa70004.

5. Reinstall Teams

Uninstalling and reinstalling Microsoft Teams can solve different issues, such as loading or connection troubles, trusted platform issues, etc. It also removes corrupt data, temporary bugs, and glitches.

Here are the steps to reinstall Teams from your device:

  • Press Win+R keys on your keyboard to open the Run dialog box.
  • Type control and hit Enter to open the control panel.
  • Click on Programs and features.
  • Locate Microsoft Teams and right-click on it.
  • Click
  • Confirm by clicking Yes.
  • Follow the on-screen instructions to uninstall Microsoft Teams from your device and restart your pc.
  • Download MS Teams.
  • Open the file and follow the instructions to reinstall it.

Now, open Microsoft Teams again and check for a perfectly working application.

6. Stop Using VPN

MS Teams is a real-time business communication platform. This app runs into interruptions while communing with the remote server through a VPN. It also introduces a delay while establishing a connection with the application server.

So, stop using virtual private networks to avoid the aforementioned error or login issues on MS Teams.

7. Logout from Other Devices

If you logged in to the Teams account from multiple devices, you can face the CAA20002 error code.

Therefore, you should log out of the Teams account on the other devices. To log out of Teams, open the Teams app. Then click on your avatar from the top and select Sign out.

Once you’re logged out of the Teams account on all the other devices, check if Teams work perfectly on your device.

8. Use the Web Version of Teams

In case you need to use Teams urgently and don’t have the time to troubleshoot it, use the web version of Microsoft Teams.

Though there are differences between the Teams desktop app and the web version, the basic and most used functionalities are available on both platforms.

Open the web browser, visit the Teams website, and log in using your Teams credentials to get the job done.

9. Ask to Change the Policy

Changing the Microsoft Teams policy can solve the connection difficulty. If the admins can filter your account from the block list due to logging in from multiple devices, you will no longer receive the error code on your MS Teams account.

Contact the Team admins and ask for help to overcome this issue.

Why Does the Microsoft Teams CAA20002 Error Appear?

The Teams error CAA20002 appears because of piled-up cache files, VPN usage, incorrect account settings inside the Windows 11 OS, and conflicting policy settings of the app. Sometimes, frequent changes in log-in locations or devices trigger the error code.

The error code CAA20002 of Microsoft Teams is triggered by the above-mentioned reasons when the app fails to authenticate you or connect to the servers.

For your understanding, I’ve listed all the possible reasons behind this MS Teams annoyance in this section.

Here are the reasons why Teams cannot connect to the servers:

Redundant Teams Cache Files

On any OS, whether Windows or Mac, cache files are required to run an app and execute its processes smoothly. But over time, these temporary files pile up on the storage disk.

A large volume of such files can conflict with each other and interrupt the background operations. As a result, glitches and bugs plague the system.

So, you never know; they might be the culprit behind the server problem on MS Teams.

VPN Usage

MS Teams requires real-time communication with its remote server. Using a VPN will delay this connection and interrupt MS Teams’ real-time data exchange with the server.

A VPN also changes your location to a completely different one and triggers an alarm on the Microsoft Teams account security.

That’s why using a VPN causes Teams to throw the CAA20002 code and prevents you from signing in to your account.

Conflict Between Windows and Microsoft Teams

If the account you’re using for Microsoft Teams is not listed on Windows, you might encounter a login error.

You know, MS Teams app syncs your profile details, fetching data from the Windows accounts manager on your PC.

When the account is not found there, Teams sometimes recognizes it as an unauthorized login attempt.

Multiple Device Login 

When you sign in to MS Teams from multiple devices, you might get blocked temporarily and encounter the caa20002 problem.


No matter how many times you try to log in, you’ll receive the error message repeatedly until signing out of other devices.


What is Microsoft Team’s Error Code caa20002?

Microsoft Teams error caa20002 means the MS Teams client can’t connect with the remote server.

Why Can’t My Microsoft Team Connect to the Server?

Microsoft Teams may not run appropriately if you use any VPNs or proxy servers on your PC. Outdated software versions, stacked-up cache files, and conflicting background processes also interrupt the connection.

Why Am I Having Trouble Signing in to Microsoft Teams?

If you’ve logged in to Microsoft Teams from multiple devices or multiple locations, this may violate its policy. Stop using VPN and log out of devices other than your primary one.


The Microsoft Teams Error CAA20002 is widespread among its many users.

This article showcases the different fixes for the CAA20002 error, such as clearing the Teams cache, using TLS 1.2 from Windows Internet Settings, adding Teams account on Windows Account Manager, changing the Teams account password, or reinstalling Teams.

Hopefully, you’ve found the working fix for it in this guide.

Comment down below if you’ve any further queries. Have a nice day!

About The Author
Steven Arends is a computer science graduate and tech enthusiast with over 10 years of experience in the field. He has a vast collection of computer hardware and loves exploring the latest advancements. As a contributing author to 10Scopes, Steven shares his expertise to make the world of technology more accessible and easier to understand for all readers.

Leave a Comment