Hi @Léo_Chambon, welcome to the Asana Community Forum! As it stands, it’s currently not possible to send a notification to a user who is not part of Asana when a form submission is marked complete. We have a popular thread for the request to add the form submitter as collaborator, if you are interested, you can upvote here: Automatically Adding Task Collaborators via Asana Forms
@Phil_Seeman is this something Léo could achieve with Flowsana? 