Follow along with the video below to see how to install our site as a web app on your home screen.
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The APS Catalog has been deprecated and removed from all Plesk Obsidian versions. Applications already installed from the APS Catalog will continue working. However, Plesk will no longer provide support for APS applications.
Please be aware: with the Plesk Obsidian 18.0.78 release, the support for the ngx_pagespeed.so module will be deprecated and removed from the sw-nginx package.
Our admins got it solved - Plesk Premium Mail caused that problem
https://support.plesk.com/hc/en-us/articles/12387614382743-The-default-certificate-is-used-for-IMAP-connection-when-the-Plesk-Premium-Mail-is-installed
I'm experiencing exact the same problem with a customer's server when trying to attach the Lets Encrypt Cert to the mail services of a specific domain (might be 2 domains affected, out of more than 50 working fine). I even deactivated the DNS service for that domain and did a plesk repair web...