Getting 500 error when trying to assign created price extension to customer

[Nadezhda Yakuba]

So, I successfully create price extension via google ads api v4 (we are 
planning to upgrade to version 6, but for now I have to cope with v4)
Request for creating price extension looks like this:

customer_id: "3084105835"
operations {
  create {
    price_feed_item {
      type: BRANDS
      language_code {
        value: "en"
      }
      price_offerings {
        header {
          value: "Some header 1"
        }
        description {
          value: "Some description 1"
        }
        price {
          currency_code {
            value: "RUB"
          }
          amount_micros {
            value: 10000
          }
        }
        unit: PER_YEAR
        final_urls {
          value: "http://elama.global";
        }
      }
      price_offerings {
        header {
          value: "Some header 2"
        }
        description {
          value: "Some description 2"
        }
        price {
          currency_code {
            value: "RUB"
          }
          amount_micros {
            value: 10000
          }
        }
        unit: PER_YEAR
        final_urls {
          value: "http://elama.global";
        }
      }
      price_offerings {
        header {
          value: "Some header 3"
        }
        description {
          value: "Some description 3"
        }
        price {
          currency_code {
            value: "RUB"
          }
          amount_micros {
            value: 10000
          }
        }
        unit: PER_YEAR
        final_urls {
          value: "http://elama.global";
        }
      }
    }
    extension_type: PRICE
  }
}

The created item reference: 
"'customers/3084105835/extensionFeedItems/146825616700'"

Then I try to create customer extension setting with this price extension 
via CustomerExtensionSettingService, and I get a 500 Internal server error

Request looks like this:

customer_id: "3084105835"
operations {
  create {
    resource_name: "customers/3084105835/customerExtensionSettings/PRICE"
    extension_type: PRICE
    extension_feed_items {
      value: "customers/3084105835/extensionFeedItems/146825616700"
    }
    device: DESKTOP
  }
}


What am I doing wrong?

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