Unfortunately, that made no difference 
I believe I have the proper scopes:
write_inventory
read_locations
write_orders
read_inventory
read_orders
write_assigned_fulfillment_orders
read_assigned_fulfillment_orders
write_fulfillments
read_fulfillments
write_merchant_managed_fulfillment_orders
read_merchant_managed_fulfillment_orders
But I was a little confused at the idea of a fulfillment service. the
format of my post to
/admin/api/2023-01/orders/{internal_order_id}fulfillment_orders/
looks correct…Is there another step somewhere? (I am correctly using the
fulfillment order IDs and item IDs in the POST)
The old “orders/{internal_order_id}/fulfillments.json” endpoint was SOO
much easier!
Thank you for any direction you have!