When calling “Create Folder (https://developer.box.com/reference/post-folders/)”,
an HTTP status 403 error was returned with:
code: access_denied_insufficient_permissions
message: Access denied - insufficient permission

The API documentation states:
403
This error is returned when the user lacks the necessary access permissions to perform this action. This may be because the user lacks access to the folder or its parent folder, or the application lacks write permissions for files and folders.

However, in this case, what specific permission was lacking?