Hello! A question of how to proceed to migrate the ownership of the site. I did it as follows, I changed the domain property by the interface. OK! The new owner started to see the site through its interface. But I noticed that it just created the name of the web folder in the new user. An empty folder. I manually copied the files from the old to the new one, changed the permissions, and adjusted the symbolic link to the new client. Would this be the procedure?
Just change the owner in the website settings. What @Marcio Urakawa encountered is not the normal behaviour and not reproducible here, so there must be something wrong with his ISPConfig setup in general.