I cant figure out why this notfication wont show. Its the exact format from another inbuilt module. I would appreciate your help

Im on v15

    def _send_notification(self):        
	​	​if not self._is_applicable():            
	​	​	​return {                
	​	​	​	​'type': 'ir.actions.client',                
	​	​	​	​'tag': 'display_notification',                
	​	​	​	​'params': {                    
	​	​	​	​	​'message': _("Nothing to send"),                    
	​	​	​	​	​'type': 'info',                    
	​	​	​	​	​'sticky': False,                
	​	​	​	​} 
	​	​# do other stuff