Fix Microsoft Teams Error Code 300 on Mac


Microsoft Teams seems to have helped put the rivalry between the Redmond giant and Apple on the back burner. Many Mac users work from home and rely on Teams to complete their work tasks and collaborate with co-workers. All is well when Teams works as expected. However, there are times when the app does not work properly. In this guide, we will discuss Microsoft Teams error code 300 and how you can fix it on Mac.

What are the causes of Teams error 300 on Mac?

The 300 Teams error code typically occurs after changing your AD (Active Directory) or Teams password. The app fails to clear the old password, preventing you from signing in.

How do I fix Teams Error 300 on my Macbook?

The 300 error essentially prompts users to reconnect. But when you hit the Log in , the application will restart on its own instead of allowing you to enter your credentials. Uninstalling and reinstalling Teams does not resolve this issue, so follow the troubleshooting steps below.

Use Teams for the web

If you are unable to sign in to your desktop app, go to and try to sign in to your account. Teams for Web is rarely affected by the same issues that cripple the desktop version. Of course, this is not a solution in itself. This is just a quick workaround that will hopefully allow you to log into your account and connect with your colleagues or peers.

Log out of the application

A quick method to resolve this error is to use the logout option. Simply put, you need to launch Teams, right-click the app icon in the Dock, and then select Logout.log out of mac Teams

Wait two or three minutes for the app to fully recycle. You can then try to reconnect and check if it works. Additionally, if this method fails, you might need to close Teams after signing out. So, right click on Teams, select Sign Out, close the app, launch it again, then sign back in.

Basically, by signing out, your Mac dumps the .plist files that allow Teams to sign you in using the new password.

Remove Microsoft Passwords

If this error occurs after changing your Microsoft passwords, go to Keychain and remove your Microsoft passwords.

  1. Go to the Keychain Access app on your Mac. Click on The window and select, Access to the keychain in case your key chains are not visible.
  2. Then select your Microsoft password for mac keychain access
  3. Go to Deposit and select Wipe off.
  4. Click on Remove references.
  5. Restart your Mac and relaunch Teams.
  6. Check if you can log in using your new password without getting the 300 error.

Empty the cache

Clearing the cache can help the app clear your old Teams credentials and files and validate the new password.

  1. Quit Microsoft Teams completely.
  2. Launch Searcher and hold the Option key.
  3. Then click on the To go menu and select Library.
  4. Navigate go to “~ / Library / Application Support / Microsoft / Teams /
  5. Open the Teams folder and delete all files from the following folders: Application Cache, blob_storage, Cache, databases, GPUCache, IndexedDB, Local Storage, and tmp.Microsoft teams remove cache from macOS apps
  6. Restart Teams and see if you can sign in to your account.


Microsoft Teams error code 300 indicates that the app was unable to use your saved credentials to sign in. To resolve this issue, sign out of Teams and extract your Microsoft passwords from the Keychain. Click on the comments below and let us know which method worked for you.


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