First, ensure that the email address or phone number set for verification is correct and able to receive messages. If email is selected, check your spam or junk folder.
If the contact details are correct, request a new verification code and use only the most recent one, as any previous codes will no longer be valid. If the code is still not received, or if the verification method is no longer accessible, contact the TMS Helpdesk to have the two-step verification reset. You will then be prompted to set it up again with updated details.