DMARC causing email rejection

DMARC causing email rejection

Hi, I am using Google Workspace; emails from Nimbus are getting rejected (and after chatted to Google support they pointed me to) Nimbus's DMARC records. Is anyone else having this issue?

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Sender:  bounces+4745825-0a4f-########@email.recurly.com
Recipient: 1 recipient
Date: Jun 19, 2021, 3:22:03 PM
Message ID:
Direction: Received
Status: 0/1 Delivered

Received from an SMTP server with IP address: 167.89.104.137 (TLS enabled)
550-5.7.26 Unauthenticated email from <a href="http://nimbusweb.co" target="_blank">nimbusweb.co</a> is not accepted due to 550-5.7.26 domain&#39;s DMARC policy. Please contact the administrator of 550-5.7.26 <a href="http://nimbusweb.co" target="_blank">nimbusweb.co</a> domain if this was a legitimate mail. Please visit 550-5.7.26 <a href="https://support.google.com/mail/answer/2451690" target="_blank">https://support.google.com/<wbr>mail/answer/2451690</a> to learn about the 550 5.7.26 DMARC initiative.‚Äč