We're currently using the Atlas Service Broker (https://github.com/mongodb/atlas-osb) which is built using the native Atlas REST APIs.

In the project creation, it creates the project using the POST /api/atlas/v1.0/groups endpoint via an API key. As a result, we have an unexpected user added as the project_owner of the project.

THis is due to:
IMPORTANT

To create a project using API Key credentials, you must specify an orgId. When you do, Atlas automatically selects the Owner of the specified organization with the earliest account creation date and time as the Project Owner for the newly created project.

The API should be expanded to allow for a user to be configured as the default project owner, or the project should not require a default project_owner at all when it is created via an API.