Have you already clicked on the link in the email? The SMS (including access code) will only be sent after you click on the link that will take you to the access screen.
Still not receiving an SMS? Then check with the sender whether the correct number has been entered.
If you are convinced that the correct telephone number has been entered, but you do not receive an SMS, please contact firstname.lastname@example.org.
The code you receive by text message is valid for five minutes.