Fulfilling order with gift card and regular item

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I am trying to send a fulfillment request for an order that contains a gift card and a regular instock item being shipped. The issue I am having is that the fulfillment is failing with an error that says the fulfillment server has to be the same for both items.

This is the request:


This is the response:

{"errors":{"base":["All line items of a fulfillment must use the same fulfillment service"]}}

I have tried passing the fulfillment_service on the item lines, but got the same result.

Is there something I am missing in the request, or are mixed gift card/ item order fulfillments not possible?