Are you looking for the POST projects/:project_id/storage endpoint, which creates a storage location in the OSS where files can be uploaded to?

I'm guessing they may have retired the BIM360 documentation, this is the one I've been testing with: https://aps.autodesk.com/en/docs/data/v2/reference/http/projects-project_id-storage-POST/.

I recall running into either the same or a similar error when I tried to use the root folder ID. Do you know if your folder ID is the root folder or a sub folder?