Installation was successful onto Centos6 and running certbot-auto listed all my vhosts by number.
I was able to choose two domains and the certificates were installed. Just for simplicity these were numbers 200,201 and 202,203 - both domains having www and non-www vhosts. all good.
next I tried just 9,10 and late 13,14 - both claimed to be associated with 128 which is a domain with a commercial SSL installed.
I wonder if it is because these domains are ‘higher up’ the list and are competing with 128? or is this a red herring.
The main concern is why these domains (9, 10, 13, 14) are being associated with 128 on install and is there a way to debug this.
If you want to see the conflict in action visit: http://www.bargainingpower.com (all good on port 80) then try https://www.bargainpower.com - warning message - click advanced and see it is associated with https://firsttranslationcompany.com (also on my server but secured with another brand of ssl)
Best
Hugh