Getting error: Ordered item(s) is out-of-stock in Shopify
Update the quantity for the ordered product in your Shopify store. Once updated, try creating the order manually from the App. By using these steps:
1.) Go to the order section of the App.
2.) Select the order in which you provide the inventory.
3.) Choose “Create order on Shopify” from the bulk action.
4.) Click on the submit button.
Please check the below screenshot: 
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