public function validateRegistration(WorkspaceRegistrationQueue $workspaceRegistration)
    {
        $this->roleManager->associateRolesToSubjects(
            [$workspaceRegistration->getUser()],
            [$workspaceRegistration->getRole()],
            true
        );

        $this->om->remove($workspaceRegistration);
        $this->om->flush();
    }