Plesk - How to determine user account from sub1**_* details

grep sub11_11 /etc/passwd

sub11_11:x:10027:505::/var/www/vhosts/example.com:/bin/false

or you can just open /etc/passwd on apache service node and find user you need.

On Windows it would be as follows:

Open Control Panel> Administrative Tools> Computer management, go to 'Local users and groups> Users', find user 'sub11_11', open it's properties, select tab 'Profile' and check 'Local path' under 'Home folder'.