Top 7 Ways to Fix Microsoft Teams Sign-in Error

Parth Shah

Microsoft Teams is enjoying its dream run in the enterprise market. The software recently passed 250 million MAU (Monthly Active Users). With the upcoming Microsoft Teams native integration in Windows 11, the number is only going to get higher from here. However, the software reliability leaves a big question mark over Microsoft Teams. Sometimes, it won’t let the users sign into the service.

Microsoft teams sign in not working

Other hurdles include Microsoft Teams showing blank white screen, screen sharing not working, and more. Among them, the sign-in error is a real headscratcher among users. If you are suffering from such an issue, let’s troubleshoot it.

Before starting, make sure that you use Microsoft Teams on an active internet connection on Windows 10.

1. Quit Microsoft Teams

Sometimes the sign-in error occurs when you don’t quit Microsoft Teams properly and open it again from the taskbar or applications menu.

Hover the mouse pointer over the bottom right corner of the taskbar, and you will see the Microsoft Teams icon there. Right-click on it and select Quit.

Quit microsoft teams

The software will completely close Teams services in the background and now you can try signing in again.

2. Close Microsoft Teams from the Task Manager

The problem with the method above is, sometimes users won’t see the Teams icon in the taskbar, even though it’s running the background. In that case, you can use the Task Manager app on Windows and completely close the Teams app and all its related services in the background.

Step 1: Press the Windows key and search for Task Manager.

Step 2: Hit Enter and open the Task Manager app.

Close microsoft teams

Step 3: Identify Microsoft Teams from the list. Select the app and click on the End Task option at the bottom.

Reboot the computer, open Microsoft Teams, and try signing in again.

3. Check Microsoft Teams Servers

Microsoft Teams is infamous for server outrage. We have seen the company facing frequent server-side errors that keep the employees out of the software for hours.

Microsoft teams outrage

You can confirm the issue from social media handles or visit Downdetector and search for Microsoft Teams. If you notice heavy outrage spikes for Microsoft Teams, you have no other option but to wait for Microsoft to fix the issue from their side.

4. Repair Microsoft Teams

Microsoft Teams throwing sign-in errors might be due to a system-level bug on your computer. However, windows offer an option to repair the apps without messing them with too much. Here’s how to use it.

Step 1: Open Windows 10 Settings app (Use Windows + I keys).

Step 2: Navigate to Apps > Apps & features and select Microsoft Teams from the menu.

Search for microsoft teams

Step 3: Click on the app and go to the Advanced options.

Step 4: From the following menu, find the Repair option under the Reset menu.

Step 5: Select Repair and let Windows handle the issue in the background.

Repair microsoft teams

Open Microsoft Teams and try to sign in again.

5. Clear Microsoft Teams Cache

This could be the main culprit behind the Microsoft Teams sign in error on Windows 10.

Over time, your computer collects the user data in the background to speed up common tasks in the app. Unfortunately, the overburden of such data can result in a sign-in error on your computer. Here’s how you can clear cache and continue using Microsoft Teams as before.

Step 1: Close the Microsoft Teams app and press Windows + R keys to open the Run menu.

Step 2: Type %appdata%MicrosoftTeams in the box and hit Enter.

Open run menu

Step 3: The command will open the File Explorer menu with Microsoft Teams files.

Step 4: Select all folders and files and remove them from the computer.

Clear microsoft teams cache

Restart the Windows 10 machine and try signing in again.

6. Access Microsoft Teams from Web

This is just a temporary solution. If you are still having sign-in issues with Microsoft Teams app on Windows 10, you can opt for the web version for the time being.

Microsoft Teams is available from the web as well. You can access the service from Google Chrome or Microsoft Edge and clear up the meetings and day’s schedule.

7. Uninstall Microsoft Teams

Microsoft Teams web is fine, but it’s not a permanent solution to replace the native app on Windows 10.

You can uninstall the problematic app and download the latest software version available from the Microsoft Store.

Go to Windows 10 Settings > Apps > Apps & features > Microsoft Teams and select Uninstall button.

Unintall microsoft teams

Download and install the latest Microsoft Teams app from the web or Microsoft Store.

Start Using Teams Again

In today’s digital era, Microsoft Teams has become an integral part of any organization. The software failing to let you sign in can spoil the mood for you. Before you check for rival services, use the tricks above and troubleshoot the issue in no time.


The above article may contain affiliate links which help support Guiding Tech. However, it does not affect our editorial integrity. The content remains unbiased and authentic.

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Parth Shah

Written By

Parth Shah

Parth previously worked at EOTO.tech covering tech news. He is currently freelancing at Guiding Tech writing about apps comparison, tutorials, software tips and tricks and diving deep into iOS, Android, macOS, and Windows platforms.