It may be due to any of the following reasons. Please confirm.
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If the domain is blocked
Make sure that emails from the “id.pf.japanpost.jp” domain are allowed, then have the email sent again, and complete the registration.
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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.
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If the entered email address is wrong (invalid)
You might have entered a wrong (invalid) email address. Please check and retry the procedure.
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?