The Cornell Enterprise LastPass account created for you will use your NetID address, so you will sign in to LastPass using your NetID address, not your alias address. You will complete two-step login using the Duo account associated with your NetID account.

But when it comes to the login information you save for individual websites, you can use any username or address you like. For example, if you decide to create an account at mac-forums.com, 

• your username can be any email address or any name (phil, philschmertz, schmertzy99, whatever)
• your registered email address can be your NetID@cornell.edu, your alias@cornell.edu, or a personal email address (p.schmertz@gmail.com).