There are no errors.
You should be getting that email to: firstname.lastname@example.org
You can see the status: ["waue_quiz_1_Status"]=> string(7) "Success"
This means it sent the email message and recieved no errors from the email server. This means that the smtp server is erroring and you may need to check their error logs, or your email is getting caught by spam filters and is actually being sent, but you aren't able to recieve it because of some email filters.