Just found the same here. I believe the confirmation code is a relatively new feature.
However, because Google does not have an account in our IIQ system, they will be disallowed from creating a ticket via email. So we can’t get there from here.
I wonder if IIQ has a workaround for this?
I created a support ticket just to see what the response is.
In the interim, I toggled the Remote Support option on and resent the verification request. That allowed Google (external account) to create a ticket via email with the verification link.
If it helps, the originating email address is: forwarding-noreply@google.com
@justin_g That is a great workaround, and it worked for me as well. However, I went in to try to resend the confirmation code, and it was already confirmed. It was like somebody at IIQ found the confirmation message and clicked the link for me. 
♂️
For those having this issue, the option is under Site Options > Settings > Allow Remote Support Tickets via E-mail - set it to On.
Hi @blankenshipr ! Once you submit the forwarding request, Incident IQ will “confirm” the forwarding request, which will support email to ticket. There is no need to enter a verification code, one confirmed by Incident IQ, so you should be good to go!
