Fix MS Teams Error Code CAA20002 [Connect to Server Quickly]

Written By Shubrato Dev Baishnab

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


Well, it clearly indicates 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, check the internet connection first and then Enable TLS 1.2 from the internet options. Also, add the Teams work account to your Windows account manager. Besides, clear Teams cache and reinstall MS Teams app if needed.

Many users also resolve Teams error code CAA20002 by changing the Teams password. So try that too.

Teams is a great collaboration platform where you can manage teams as a team leader and add guests on Teams for perfect collaboration. However, problems can occur anytime on it but you can fix it.

As for now, I’ve explained the detailed ways to resolve error code CAA20002 below; take your time and have a glance.

Here are the methods to fix Microsoft Teams error CAA20002:

1. Enable TLS 1.2 from Internet Options

The 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. However, enabling this TLS 1.2 also helps to fix the Teams error code CAA70004.

2. Check the Internet Connection

MS Teams can throw that code on the screen due to poor internet connection or no internet connection at all. This Teams fault code mostly appears when you try to sign in but can’t connect to the remote server. So, make sure you have a stable internet connection before moving on to the other fixes.

3. Add MS Teams Account in Windows

Missing Teams account as a working account from the Windows account manager also throws this type of error. So check whether it’s in the Windows account manager and add it if it’s not there.

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. 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. You can also ask your Teams admin to change the Teams 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.

5. 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. Clearing the cache files also helps to fix Teams sign-in issue.

6. Change the Teams Account Password

Some folks have solved this particular issue by changing their Teams account password. So, in case the issue still exists, try change your password. Here’s how to do that:

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

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.

7. Reinstall Teams

Uninstalling and reinstalling Microsoft Teams can solve issues like 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.

8. 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.

9. 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.

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.

In many cases, MS Teams error code is mainly triggered by improper connection to the server that uses TLS 1.2. Plus, this happens when Teams can’t connect to the remote server due to poor internet connection.

However, login to your Teams account from multiple devices will surely throw this error code CAA20002. Besides, poor internet connection is also a culprit behind this Teams faulty code.

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:

Multiple Device Login

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

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

Redundant Teams Cache Files

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

Many 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 your Microsoft Teams account is not listed on Windows, you might encounter a login error.

You know, the 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.


The Microsoft Teams Error CAA20002 is widespread among its many users. And 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 in this guide. Comment below if you’ve any further queries. Have a nice day!

About The Author
Shubrato is a tech enthusiast and avid writer with a passion for technology-related things. He earned his undergrad degree in CSE. An experienced writer about the latest gadgets & software. He knows how to explain complex concepts clearly and concisely. You’ll find him tinkering with new tech or playing the latest video games when he isn’t writing.

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