Microsoft Teams is a coveted product in the online interaction space these days. People have been increasingly using it for both, personal and professional purposes. With this heightened usage comes the responsibility to keep their product intact. There have, however, been several incidents of people reporting an error while trying to log into Microsoft Teams via the desktop application.
Coded as Error CAA2000B, there can be several factors that could lead to this error. Today, we will be discussing how to fix this error faced while logging into Microsoft Teams and what all might have caused it in the first place.
It is recommended for users to try and log into Microsoft Teams via the website to make sure that the error is caused by the desktop application.
Fix Microsoft Teams Login issues: We couldn’t sign you in
If Microsoft Teams says, We couldn’t sign you in, then follow these proven tips to fix Microsoft Teams Login issues.
- Restart the Microsoft Teams app on your computer
- Run Microsoft Teams as an administrator
- Check system time and date
- Disable Proxy in Windows Settings
- Clear the cache files of the Microsoft Teams app
- Remove Password from Credential Manager
- Clear browser cache and try again
- Repair Microsoft Teams
- Reinstall Microsoft Teams
- Create a new user account
1] Restart the Microsoft Teams app on your computer
This is a pretty elementary solution but gets the job done more often than not in these cases. Follow the steps below to restart your application cleanly.
Close Microsoft teams from the background and open the Task Manager by searching on the Start Menu or with the Ctrl + Alt + Delete shortcut key.
Under the ‘Processes’ tab, search for the Microsoft Teams application and right-click on it.
Further select ‘End Task’.
Try opening up the application again and check if the error has been solved. If not, try out one of the other solutions mentioned below.
Related: Microsoft Teams Error CAA2000B, We weren’t able to register your device.
2] Run Microsoft Teams as an administrator
For some users, running Microsoft Teams as an administrator worked. You should also try this. The following steps will help you run Teams as an administrator:
- Click on Windows Search and type Microsoft Teams.
- Right-click on Microsoft Teams from the search results and select Run as administrator.
- Click Yes in the UAC Prompt.
3] Check system time and date
Check if the time and date on your computer are correct, which can affect the ability to connect to Microsoft Teams.
4] Disable Proxy in Windows Settings
Sometimes, internet connectivity issues in some apps occur due to the Proxy settings. If you have enabled Proxy on your Windows 11/10 computer, disable it and see if it helps. To disable Proxy, open Windows 11/10 Settings and go to “Network & internet > Proxy.”
5] Clear the Cache files of the Microsoft Teams app
Corrupted Cache data files can cause all kinds of errors, including the error in question. The corrupted cache can block authentication certificates which can, in turn, result in certain hiccups while trying to log into an app. Here is how you can clear out the cache data for Microsoft Teams.
Open the Task Manager via the keyboard shortcut key or by right-clicking on your taskbar and further selecting that option and end the task, as was taught to do in the first solution.
Open the File Explorer on your computer and paste the address as prescribed below on the address bar:
This address is going to take you to the location where the cache files for Microsoft Teams are stored. Users can try and locate this section on their own, but it’s generally buried very deep.
Press Ctrl + ‘A’ to select all the files and press Shift + Del keys together to delete all the files. Confirm the process and wait till it has been completed.
The process isn’t complete yet as you have to replicate it one by one for all of the following paths too:
Once completed, try logging into Microsoft Teams again and check if the error still persists.
Read: How to add Microsoft Teams Chat Link to Email Signature.
6] Remove Password from Credential Manager
Type “Credential Manager” in the search box, then select Windows Credentials and expand related credential records to remove them.
Related: Fix Microsoft Teams Sign-in Error Codes 0xCAA20003, 0xCAA82EE2, 0xCAA82EE7, 0xCAA20004, 0xCAA90018.
7] Clear browser cache and try again
Sometimes, bad or corrupted web browser cache and cookies cause problems. If Teams is showing you the “We couldn’t sign you in. Please try again” error message in your web browser, the culprit may be your browser cache and cookies. In such a case, clearing your browser cache and cookies may fix the problem.
Deleting the web browser cache and cookies is easy. Open your web browser and press the Ctrl + Shift + Delete keys. This is a shortcut key to open the Clear History popup in almost all web browsers. Now, in the drop-down, select Everything and deselect all the options except Cookies and Cache. Now, click OK. You can also delete your browsing history if you do not require it.
8] Repair Teams
In some cases repairing Microsoft Teams can fix the issue. You can repair teams via Windows 11/10 Settings. The steps are listed below:
- Open Windows 11/10 Settings.
- Go to “Apps > Apps & features.”
- Now, locate Microsoft Teams. Once you find it, select it and click on the Advanced options link. In Windows 11, you will see the Advanced options after clicking on the three vertical dots next to Microsoft Teams.
- Scroll down and click Repair.
9] Reinstall Microsoft Teams
Before you begin with the uninstallation process, you should close the MS Teams application from the background.
Open the Control Panel on your computer. Select to view your icons by Categories and under the Program section, click on Uninstall a program.
Locate MS Teams from the group of programs that you have installed on your computer, right-click on it and select Uninstall. Wait till the process is completed to move onto the next steps.
Open the Run prompt by pressing the Windows + ‘R’ key combination and enter ‘%appdata%’ in the blank space. This will open the Appdata folder, which stores the data for the various applications running on your PC.
In order to ensure that MS Teams has been uninstalled properly and cleanly, you have to locate the Teams folder here, right-click on it, and press Delete.
Open the run command again and this time enter ‘%Programdata%’. This will take you to yet another hidden folder that stores all the program-related settings in it. If you spot an MS Teams folder here too and delete it.
After that process has been completed, you can now visit the Microsoft Store and download a fresh copy of Microsoft Teams.
Apart from the issues we have taught you to troubleshoot below, there can be several other causes behind the error CAA2000B too, like an Outdated version of MS Teams, which may be incompatible with your Windows built or a clash between your Windows credentials.
10] Create a new user account
If none of the above fixes helped you resolve the issue, the problem might be associated with your user account. We suggest you create a new user profile and then check if the issue persists in that user account. If yes, you can switch to the new user profile.
How do you fix teams cannot sign in?
If you cannot sign in to Teams, first check your internet connection. If your internet connection is working fine, the problem might be occurring due to a corrupted Teams cache. In this case, clearing the Teams cache can help. We have listed some solutions to fix this error on Teams in this article.
How do I clear MS Teams cache?
You can clear the Microsoft Teams cache by deleting all the contents inside the cache folder of Microsoft Teams on your C drive. The cache folder is located at the following location:
If this does not work, you have to delete data inside some more folders. We have explained this in detail in this article.
We believe that one of the aforementioned fixes will help you resolve the error.
Read next: Audio not working on Microsoft Teams.