How to Fix Microsoft Teams Error CAA5009D

Many users have reported facing an error while logging into Microsoft Teams App. The error message is as shown below

We’re sorry-we’ve run into an issue

Error code -caa5009d

There’s a more permanent way to sign-in to Microsoft Teams.

If you’ew having trouble completing the process, talk to your IT admin.

Note that this issue is only in the Desktop App. As a quick workaround, login to Microsoft Teams from the Web Client

If you are facing this issue and looking out for ways to fix this issue, read along. In this article, we have curated a list of fixes that will help you overcome the login error with the error code CAA5009D.

Fix 1: Run the application in Compatibility Mode

If you know that the application/ program runs without any issues in a particular version of windows, you can run the application in that version of Windows. For example, let us say you were using this application with Windows 8 version earlier. Now you are running the program in Windows 10 and you are seeing this error. You can run the program in compatibility mode with Windows 8 version and check if this resolves the issue. To do so,

Step 1: Right-click on the Shortcut of the application

Step 2: Choose Properties from the context menu


Properties Selection

Step 3: Go to the Compatibility tab

Step 4: Under the Compatibility mode section, tick the Run this program in compatibility mode for

Step 5: From the drop-down, choose the version of Windows in which you know that the application runs without any problem.

Step 6: Click on Apply

Step 7: Click on OK


Compatibility Settings



Check if this helps to resolve the issue. If not try the next fix.

Fix 2: Clear the Cache and Credentials of Teams Application

Step 1: Open the Run Dialog using the keys Windows+R

Step 2: Type the below command and hit Enter.

%appdata%\Microsoft \teams




Step 3: In the appearing window, delete the contents from the below folders. Don’t delete the folders, just delete the contents from these folders.

  1. %appdata%\Microsoft \teams\application cache\cache
  2. %appdata%\Microsoft \teams\ blob_storage
  3. %appdata%\Microsoft \teams\ Cache
  4. appdata%\Microsoft \teams\ databases
  5. appdata%\Microsoft \teams\ GPUcache
  6. appdata%\Microsoft \teams\ Indexed DB
  7. appdata%\Microsoft \teams\Local Storage
  8. appdata%\Microsoft \teams\tmp


Step 4: In the search bar next to the start symbol, type Credential Manager

Step 5: Click on the Credential Manager 


Credential Manager



Step 6: Select Windows Credentials


Windows Credentials


Step 7: Scroll down to the Generic Credentials section.

Step 8: Under this section, locate the username wrt to the Teams account.

Step 9: Click on the downward arrow next to its name.

Step 10: To remove a credential, click on the credential name from the list. You will see that the option expands showing the options.

Step 11: Click on the Remove.


Remove A Credential



Step 12: In the confirmation dialog, click on Yes.

Confirmation Dialog Box


Step 13: Now, try logging into Teams and check if this issue has been fixed.

Fix 3: End the tasks running in the background

Step 1: Right-click anywhere in the blank area on the taskbar. From the context menu that pops up, click on Task Manager



Task Manager

Step 2: In the window that opens, Make sure you are in the Processes tab

Step 3: Under the Apps section, locate the apps that you feel are interfering with the operation of Teams Application and right-click on it

Step 4: From the context menu, choose End Task.


End Task


Step 5: Once you have removed all the tasks from the background, try running Microsoft teams and check if the fix has been resolved.

Fix 4: Ensure Firewall is not blocking the access to Teams App

Step 1: Open the Run Dialog.

Step 2: Type windowsdefender: and hit Enter


Windows Defender


Step 3: Select Firewall& network protection.


Firewall And Network Protection


Step 4: In the appearing window, click on Allow an app through the firewall.


Allow An App Through Firewall


Step 5: In the list of apps that appear, check if Teams is Allowed and has a checkmark next to its name.

Step 6: If Microsoft Teams is not allowed, click on Change settings button.

Step 7: Now check the option. Ensure the Private and Public are checked.

Step 8: Click on Ok.


Allow App Through Firewall Min


Step 9: Now, check if you can log into Microsoft Teams.

That’s All.

We hope this article has been useful. Thank you for Reading.

Kindly comment and let us know the fix that helped you solve this issue.