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Solved: How do I fix Microsoft Teams Login Error Code – 80080300?

Problem Symptom

Microsoft Teams users reported error code 80080300 when trying to sign in to Microsoft Teams with work email after installing the latest Windows updates. Signing in the account through Microsoft Teams online using the browser is working fine, but the Microsoft Teams app itself is not able to launch due to sign-in error 80080300. Microsoft Teams sign-in error 80080300 caused irritations to any user due to not being able to participate in an online video call or conference.

The detailed error message is as below:

We’re sorry-we’ve run into an issue.
Restart
If that doesn’t work, try signing out and back in.
Error code – 80080300
There’s a more permanent way to sign in to Microsoft Teams. If you’re having trouble completing the process, talk to your IT admin.

Solved: How do I fix Microsoft Teams Login Error Code - 80080300?

Follow the below solution steps to resolve Microsoft Teams login error code – 80080300 issue.

Content Summary

Potential Causes
Pre-check
Solution 1: Clear Microsoft Teams login cache in Credentials Manager
Solution 2: Run in Windows 8 compatibility mode

Potential Causes

Why can’t I log into my teams account?

Pre-check

  • Restart your device and router.
  • Disconnect external devices such as camera, Display Monitor, headset and try again.
  • Make sure your local firewall, Windows defender and antivirus software settings is not blocking Microsoft Teams app.
  • Log in again using correct credentials. Additionally, check if you’re logged into Teams on another device.
  • Make sure you have the latest Windows update installed.
  • Remove app cache folders and files stored in Microsoft Teams folder: C:\Users\UserName\AppData\Roaming\Microsoft\Teams
  • Uninstall and reinstall Microsoft Teams app.
  • Sign in to Microsoft Teams web version.

Solution 1: Clear Microsoft Teams login cache in Credentials Manager

Step 1: Press the Ctrl + Shift + Esc key to open the Task Manager.

Step 2: Select the Microsoft Teams process.

Press the Ctrl + Shift + Esc key to open the Task Manager. Select the Microsoft Teams process.

Step 3: Click on the End task button.

Step 4: Type credential manager in the search box on the taskbar.

Step 5: Select the Credential Manager to access the Microsoft Teams app login credential.

Select the Credential Manager to access the Microsoft Teams app login credential.

Step 6: Under Generic Credentials, delete all the entry start with msteams_adalsso/adal_context_segments and MicrosoftAccount:user=

Under Generic Credentials, delete all the entry start with msteams_adalsso/adal_context_segments and MicrosoftAccount:user=

Step 7: Restart your device.

Solution 2: Run in Windows 8 compatibility mode

Step 1: Press the Ctrl + Shift + Esc key to open the Task Manager.

Step 2: Select the Microsoft Teams process.

Press the Ctrl + Shift + Esc key to open the Task Manager. Select the Microsoft Teams process.

Step 3: Click on the End task button.

Step 4: Press the Windows + E key to open the File Explorer.

Step 5: Paste the following address in the address bar at the top and press the Enter key: %LocalAppData%\Microsoft\Teams\current\

Paste the following address in the address bar at the top and press the Enter key: %LocalAppData%\Microsoft\Teams\current\

Step 6: Locate and select the Microsoft Teams app executable file called Teams.exe from the current folder.

Locate and select the Microsoft Teams app executable file called Teams.exe from the current folder.

Step 7: Right-click on the Teams.exe icon and select the Properties option from the contect menu. Alternatively, press the Alt + Enter key to open the Properties window.

Step 8: Switch to the Compatibility tab.

Switch to the Compatibility tab.

Step 9: Check the box for the Run this program in compatibility mode for option.

Check the box for the Run this program in compatibility mode for option.

Step 10: Select the Windows 8 option from the drop-down menu.

Select the Windows 8 option from the drop-down menu.

Step 11: Click on the OK button to apply and save the changes.

Click on the OK button to apply and save the changes.

Step 12: Restart your device.

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