DMARC Policy interupting forms

Hi team!

Tricky one for me to describe… As of 5 days ago my client is receiving orders via Webflow website as normal, however a simultaneous email follows the form submission email with the Subject: Delivery Status Notification (Failure). Then in the email “Your message was rejected due to web flows DMARC policy…”

The links go to an apply support page but I’m struggling to make sense of it and how to fix. The email listed as at the centre of it is an iCloud address, if that helps shed some light?

See attached screen shot (email address have been censored), and thanks in advance for anyone looking into it.

Thanks, Scott