Seriously, still no update that fixes this?Other parties already have ARC support, but CISCO is mentioned incorrectly:Sure! Here are the top 5 email gateway vendors that support ARC and are also mentioned in Gartner reports:ProofpointMimecastBarracud...

so almost 8 years later Cisco still has not fixed ARC support.This really makes a case for other solutions like Microsoft Defender for Office 365.

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvi29672It has been updated Jan 18, 2023, but no solution or advisory was published.