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Google Workspace Rejecting Sophos Setup Messages (and other important messages

Messages are being rejected by GMail with DMARC failures. Most of the messages are from well known senders such as Google, Microsoft, and the USDA. The senders' DKIM is in order and we have correct DMARC, SPF and DKIM settings with respect to our DNS. Gateways are in place per the documentation. GMail extra spam checks are turned off. Here's a rejection of the Sophos Central welcome email:

Received from an SMTP server with IP address: (TLS enabled)
550-5.7.26 Unauthenticated email from <a href="">" target="_blank"></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="">" target="_blank"></a> domain if this was a legitimate mail. Please 550-5.7.26 visit 550-5.7.26 <a href="">" target="_blank">> to learn about the 550 5.7.26 DMARC initiative.
Mar 24, 2022, 4:32:23 PM
Has anyone else encountered this?
Google suppport said that it's an SPF issue, but I've triple-checked my settings and they're correct.

Edited tags
[edited by: Raphael Alganes at 6:02 AM (GMT -7) on 7 Jun 2023]