Cloud permissions for test merchant -- "does not have read access to the resource: /orders/items"

I receive a 401 when creating a webhook with ORDER_ITEM_**** in the event-types for a test merchant.

The principal does not have read access to the resource: /orders/items

I do NOT see this error and can successfully create a webhook with ORDER_****.

ORDER_ITEM_ORDERED -> fails

#----- Request
poynt.Hook.create_hook(
    ****
    event_types=['ORDER_ITEM_ORDERED'])

#----- Response
({'code': 'UNAUTHORIZED_ACCESS',
  'developerMessage': 'The principal does not have read access to the resource: /orders/items',
  'httpStatus': 401,
  'message': 'Access not authorized for the requested resource.',
  'requestId': 'de25de1d-334d-401f-a7b7-970dbb5ea050'},
 401)

ORDER_OPENED -> succeeds

poynt.Hook.create_hook(
    ****
    event_types=['ORDER_OPENED']
)
Out[12]: 
({ ****** }, 201)

Under Developer > Apps > [My App] > Cloud Permissions, I selected all permissions, saved, then granted permissions to my test merchant.

I notice there are permissions for Orders, not OrderItems – I assume Orders would contain OrderItems though??