Error creating server group as scoped role user

[domain@localhost:9999 /] /core-service=management/access=authorization/server-group-scoped-role=main-MAINTAINER:read-resource
{
    "outcome" => "success",
    "result" => {
        "base-role" => "MAINTAINER",
        "server-groups" => ["main-server-group"]
    }
}

[domain@localhost:9999 /] /server-group=fooBar:add(){roles=MAIN-MAINTAINER}
{
    "outcome" => "failed",
    "failure-description" => "JBAS014807: Management resource '[(\"server-group\" => \"fooBar\")]' not found",
    "rolled-back" => true
}