contact@democracy.io | Email Deliverability Failure

[zraineri]

Recieved a bounce when attempting to email contact@democracy.io (the only email I could find on the website)

Response:
Final-Recipient: rfc822; contact@democracy.io
Action: failed
Status: 5.0.0
Remote-MTA: dns; mx1.forwardemail.net. (178.62.29.206, the server for the
domain democracy.io.)
Diagnostic-Code: smtp; 550 Your email contained an invalid DKIM signature. For more information visit https://en.wikipedia.org/wiki/DomainKeys_Identified_Mail. You can also reach out to us for help analyzing this issue. - if you need help please forward this email to support@forwardemail.net or visit https://forwardemail.net
Last-Attempt-Date: Wed, 25 Mar 2020 10:15:41 -0700 (PDT)

I got the email by selecting "Email delivery API" in the copyright bar. I'm trying to get access to the api, is that still a thing?