If you're having issues with ShippingEasy not sending inventory updates to your Magento 2.1.x store, the issue could be related to the Magento 2.1 store or product configuration settings. We recommend double-checking the following settings:
Have you linked all of your products in your ShippingEasy product catalog with your store?
In order for ShippingEasy to send inventory updates to your store, SKUs in your Products catalog must be linked with - or mapped to - the product listings in your store. This ensures that when stock levels change in ShippingEasy, those levels can also be reconciled in your store. Learn more about linking your product SKUs to your store.
Have you enabled the "Set available stock at store setting"?
In order for the inventory updates to be sent by ShippingEasy, you'll first need to enable the set available stock setting in your Store Settings in ShippingEasy. Learn more about sending inventory updates to your store.
Enabling this setting means that ShippingEasy controls your available inventory quantities. Any updates to your inventory levels should be made directly within ShippingEasy. If you edit the amount of inventory you have available on your sales channel directly, ShippingEasy will override these updates.
Have you setup multiple listings for the same product in your store?
If you have multiple listings for the same product in your store, ShippingEasy will only update one product listing per Product SKU. If you have multiple listings for the same product, on the same store, then each listing must be assigned a unique Product SKU.
In order for ShippingEasy to update all of the inventory levels in your Magento 2.1 store you must alias each unique Product SKU to point to one inventory record in ShippingEasy. Learn more about assigning SKU aliases from the same store.
For products that have product options, did you configure your products to have configurations instead of customizable options?
In order for ShippingEasy to update the inventory levels for a Magento 2.1 product with different configurations (such as colors or sizes), be sure to use a 'configurable' product type and add configurations with their own specific SKU. ShippingEasy cannot update the inventory for a simple product that uses 'customizable options' to implement different product configurations. Learn how to configure Magento 2.1 products for inventory management (simple products and configurable products).