There is more than one reason for this error to occur. Here are steps you can take to resolve the issue.
First, confirm that you created an account. If you entered an email address and password and were able to view your images, then you created an account.
Next, confirm that the email address and password are correct. Test any other email addresses that you own to check whether you created your account with another email address.
Next, click the “Forgot Password” link on the Sign-In page. Enter the email address you used to create your account and click the Reset Password button. You will receive an automated email with a temporary password which you can use to login. Be sure to check your Spam or Junk folders if you do not see the automated email in your inbox.
If the Forgot Password page reports, “No account matching this email address was found”, then either an account was not created successfully or you may have mistyped your email address when creating an account. If this happens, click the “Help” link at the bottom of the page and then click the “Contact Us” form. Fill out the information on the form and include passenger name(s), Internet ID number(s) and any possible email addresses you may have tried to create your account.