The management for of the plugin allows the definition of one or more domains which should be used for searching the user account.
The help indicates that the names should be separated by comma.
I am not able to define a list of domain names separated by comma or any other delimiter.
and as delimiter ',', ';', ' ', ':'
When tested the error message shows the value entered as domainname and not splltted in the domains. The message ist consequently: domain not found.