Q. I tried to set up two-factor authentication via SMS, but I have not received an SMS with the authentication code for two-factor authentication

It may be due to any of the following reasons. Please confirm.

• If the SMS is blocked
  It may be due to the SMS block setting. Please contact your mobile carrier for the setting method and so on.
   
•  If you have set up “security settings,” etc.
  Depending on your “security settings” or “forwarding settings,” emails may be sorted into the spam folder or may not be received at all.
   
• If the entered mobile number is wrong (invalid)
  You might have entered a wrong (invalid) mobile number. Please check and retry the procedure.
   
• If you are using a data SIM
  If you are using a data SIM, the SMS function may not be available.

Please contact your mobile carrier for various confirmation and setting methods.

＜Related questions＞
Q. How do I have the authentication code sent again for two-factor authentication sent via email or SMS?