The One-Time Access Code for Enhanced Security has a 10 minute expiration from the time that it was generated. If the One-Time Access Code is not used within 10 minutes, it becomes invalid.
You can choose where you want to receive the One-Time Access Code from the list of channels you have already registered. For example, you can register one email address and two phone numbers.
If you don't receive the One-Time Access Code, you can select a different channel you want it to be sent to. To register additional channels, click on My Settings at the top right of the screen and click on Security.
If you're still having difficulty, please call our Customer Service Department and they will be able to assist you.