The user may on occasion receive a Yahoo mail verification code or link to the mobile phone or email address to safeguard the user's account and ensure that the user is the one trying to access it. If the user can't understand the code or the URL, Click Resend within the first five minutes. Whether Yahoo not sending verification code, see if the user used a landline. Check to see if the transmitting data limit of the plan has not been reached. Search for email or contact information errors. Check to be sure the email wasn't filtered as spam or deleted from the backup address.