@AndreaM - subtasks are not associated with projects, but rather their parent task (which is, in turn, associated with the project). There are a number of forum topics on that, esp. in non-dev contexts, e.g.:
What specifically are you trying to get? All tasks/subtasks in your workspace, in a specific project, or something else? There are a few approaches depending on what you’re trying to do:
- You can use the endpoint you already tried (get multiple tasks) but include
assignee=nullto also get unassigned tasks. - You could use the search API to return tasks by criteria
- You could iterate over one/more projects, call the get tasks for project endpoint and then iterate over the returned tasks to also grab any subtasks