As of now, Microsoft has not confirmed any known bugs related to sign-in issues with Outlook Calendar. There are no widespread incidents reported that would indicate a systemic problem affecting calendar access.

🧭 What to Do If You Can’t Sign In

If you’re experiencing sign-in issues, consider the following steps:

• Verify your credentials and ensure you’re using the correct account.
• Clear your browser cache and try again.
• Try a different browser or device to rule out local issues.
• Check your network connection and firewall settings.
• Confirm with your IT team whether there are any organization-specific restrictions or outages.