We are currently aware of a number of users encountering errors with Mail Clients and Browsers being unable to verify the server identity. To resolve this issue, you will need to reissue the SSL certificate as per the guide ...
We received reports of false error messages appearing in Plesk control panels. We are actively working on this with the Plesk support team.
The false error messages do not impact your actual DNS records or any domain forwards you have running.
We will update this service update once the issue is resolved.