How to fix Cannot Login to Microsoft Account in Edge: Error code: 3, 15, -21468938022?

1. Make sure your operating system is updated to the latest version. You can click on "Settings"-- Check for updates in Windows Update.

    

2. Make sure your Microsoft account credentials are correct. You can try logging into the Microsoft account home page with the same credentials on another device to verify that they are valid:

   https://account.microsoft.com/

    

3. Try to clear the browsing data and cache of Microsoft Edge. You can do this by selecting "Settings and more" - "Settings" - "Privacy, Search and Services" - "Clear browsing Data" in your browser.

    

   Disclaimer: Your browser automatically saves temporary internet files to help pages load faster. Clearing this cache will sometimes fix page display problems. Please back up all your personal files first, such as Favorites, to ensure you do not lose data.

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