There are a couple of common reasons that will cause an inability to create a Shopify order. The first is because the product that was selected by an influencer was manually created rather that imported from your Shopify account. If a product is not imported, an order cannot be created because their is no link between that product and your Shopify store.
Another reason that you may be unable to create a a Shopify order is because changes were made to the product. Certain changes that are made to a product can break the syncing between Grin and Shopify.
When editing imported products the message above will be present to notify you that changes can be made, but certain changes could cause the sync between Grin and Shopify to break. Once the link is broken it will not allow you to create an order.
To learn more about the Shopify integration, click here.
To learn how to integrate your Shopify store, click here.