If you never receive the SMS from Swan, first, please add the following telephone number to your contacts (+1 726 200 7926). Then please re-enter your email, and resend yourself a new text message here. This time make sure you change your location and connect to wifi, to give yourself the best chance to receive the text message.
If that still doesn't work please contact support and submit a ticket under "Onboarding >> Other" listing the cell number that you are using that is not receiving texts.