If you're experiencing difficulties signing into Xbox Live on your PC and encountering the error code 0xcffff43c, you're not alone. This issue has been affecting many gamers, preventing them from playing their favorite games. This error typically indicates a problem with the Xbox Live service rather than an issue with your PC.

Thankfully, there's a simple solution to resolve this sign-in error by signing out and back into the Microsoft Store. Follow the steps below to fix this problem and get back to gaming.

How to Fix Xbox Live Sign-In Error 0xcffff43c

Step 1: Open the Microsoft Store application on your PC. Once it's open, navigate to the top-right corner of the window and click on your profile icon.

Microsoft Store Profile Icon

Step 2: From the dropdown menu, select your Microsoft account to access account options.

Select account in Microsoft Store

Step 3: An 'Account' window will appear. Click on the 'Sign out' button located beneath your account name to log out of the Microsoft Store.

Step 4: After signing out, close the Microsoft Store completely to ensure the changes take effect.

Step 5: Reopen the Microsoft Store on your PC. Once open, click on the profile sign-in (+) button at the top-right corner and choose the 'Sign in' option from the menu.

Sign in with your Microsoft Account in Microsoft Store.

Step 6: Enter your Microsoft account credentials to sign back into the Microsoft Store.

Step 7: After signing in, click on the three-dot menu icon in the top-right corner of the Microsoft Store window. From the dropdown options, select 'My Library'.

My Library in Microsoft Store

Step 8: In the 'My Library' section, click on the 'Installed' option on the left side panel to view all the apps and games installed through the Microsoft Store.

Installed Apps from Microsoft Store

Step 9: Find the game that was showing the Xbox Live sign-in error 0xcffff43c. Click on the game to open its page within the Microsoft Store.

Step 10: On the game's Microsoft Store page, click the 'Launch' button to start the game directly from the store.

After launching the game through the Microsoft Store, the sign-in error should be resolved, allowing you to sign into Xbox Live and play without further issues.

If you continue to experience the error after following these steps, the issue might be due to ongoing problems with the Xbox Live service. In such cases, checking the Xbox Live service status on the official website or waiting for Microsoft to address the service outage is recommended.