Here's my idea:
First, having a flow triggered when a new Project is created, action being creting a new Teams team.
Second, having a flow triggered when ressources are assigned to a Project, action: adding those same people to the Teams team.
Or alternatively, creating a new Project and assigning ressources to it, then trigger: when a Project is published, action: create new Teams team with assigned ressources as team members.
See the following document for the available trigger or actions in Project Online and Microsoft Team connector:
Besides, I will move this posts into Flow feedback.
That info shows how to create a new channel in an already existing team, what I would like to do is create a new Team.