
Fix Windows Defender Authentication Failed After Update
After a recent Windows update, you might see an error like "Authentication failed" when trying to...

After a recent Windows update, you might see an error like "Authentication failed" when trying to...

You're working in Chrome and suddenly see a rate limit error—a message like "429...

When you open Microsoft Store and see an SSL certificate error—like 'A certificate is required to...

When you try to install a Windows app from the Microsoft Store, you might see error code 0x80073b...

You may see a Windows Defender error like 'Token expired' or 'The token is expired' in the Window...

When you open Outlook and it sits there with a white screen or the title bar says “Not Responding...