Certificate not sent

Hi everyone.

Firstly, I must say that the “Send email to user” option and “Send certificate to user” are enabled, as shown in the attached image. “Email Configuration” also has a valid sending email.

However, after the user takes the Quiz and obtains a score sufficient to receive the certificate, this email is not sent to them. The interesting thing is that the admin receives the copy (as the “send e-mail to admin” option is checked), but the user does not receive it.

Also, the “test email” is being sent without problems:

tldr: the admin receives the email of the Quiz completed; email tests work; but the user does not receive the email after completing the Quiz and reaching the minimum score (in this case, he should receive the certificate, right?)

Attached images to help.

Thanks.