On a PLESK for windows installation, there was a problem reactivating websites, everything seems fine when you activate, then you refresh the page and it is inactive, the answer was in activating the domains from the command line after activating the client’s account
cd c:\Parallels\Plesk\admin\bin
Then
domain.exe –on domainname.com
(Type it in yourself, and notice that — is 2 consecutive dashes)
You should see
SUCCESS: Changing status of domain ‘domainname.com’ completed.