Typically when we see this it's for one of two reasons:
1. The email is caught in junk/spam folder
2. There was a typo in the email address and the confirmation email was sent somewhere else
You can test number 2 above by trying to create a new account with that same email address. If you get the confirmation email, then just follow the steps to complete your account. If you get an error telling you it's already in use, then you know you typed it correctly the first time and there is something else going on.
Please note, when you try creating a new account, use a username you'd actually want (you are the only one that sees it in the app anyways), because if the account does go through, that's your app account. Our security platform doesn't allow multiple of the same email addresses linked to different usernames.