Apple offer codes error when creating with upfront/as you go payment

Question

I get the following error when I am trying to create an offer code with one of the next options of payment: upfront/as you go.

{
  "errors" : [ {
    "id" : "4d5b0d52-9c68-46e6-a659-687f512acde1",
    "status" : "409",
    "code" : "ENTITY_ERROR.ATTRIBUTE.UNKNOWN",
    "title" : "The provided entity includes an unknown attribute",
    "detail" : "'priceTier' is not an attribute on the resource 'subscriptionOfferCodePrices'",
    "source" : {
      "pointer" : "/data/attributes/priceTier"
    }
  } ]
}

Can anyone help?