One common reason for login failure is entering incorrect credentials. Ensure the following:

• Username: Enter your username (e.g., xyz.a). Do not use your email address.
• Password: Your password should be the same as your NIIT system password. Avoid using a PIN.

Another possible issue is an outdated password. Follow these steps to resolve it:

• Reset your password at https://myaccount.microsoft.com
• Wait for 15 minutes after resetting your password.
• Try logging in again.