I cannot activate the trial because the serial number I got in the email was listed as "connection failure".
Check to see if a second email comes in with the real serial number.
If it doesn't, log back into your user account, and fill out any missing required fields, then go through the process of requesting the serial number again. If you are told that you already have a serial number, send an email to firstname.lastname@example.org and request another serial number. Be sure to reference this tech note when you request the new code.