LogMeIn Anti-virus Protected by an older version of antivirus software. Automatic update pending

Several of our clients are displaying the message in the LogMeIn Central portal "Protected by an older version of antivirus software. Automatic update pending."

When I compare AV versions on PCs, all PCs are running LogMeIn AV version 6.6.21.304.  This is the latest version according to the "What's New" page.

https://support.logmeininc.com/central/help#central-c-central-whatsnew

The PCs are Windows 10 PCs.  The PCs are running LogMeIn version 14072.

I have tried rebooting the PCs.  Initiating Updates manually from the client on the PCs.  Nothing works.

How can we resolve this issue?

Thanks.