If you would like to notify someone about their tender bid not being successful, here is a sample template you can use to write a notification letter to an unsuccessful tenderer.
Dear, [Client name]
Thank you for your response to the [Company name]’s request for [tender] of the provision of [Project name]. However, we regret to inform you that this has been unsuccessful.
Nevertheless, I would like to thank you for your time and effort to respond to [Company name]’s request.