This article will show you how to enable Square's Inventory Tracking feature for new products.
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How to Turn Inventory Tracking On in Square
Overview
Square's inventory management lets you toggle inventory tracking on or off for new products, this feature is responsible for monitoring your stock levels, ensuring you know when items are running low. Only with this feature enabled, SKU IQ can accurately sync inventory with your eCommerce site.
If it's off, Square may report zero stock, marking items as "OUT OF STOCK" online, or send a "null" stock value, disabling tracking and risking overselling. This can lead to inventory errors and customer frustration.
Please reference this guide to turn on inventory syncing on your Square POS and ensure stocky quantity sync will be working for your account.
Video Guide
How to Turn Inventory Tracking On in Square
1. Log in to your Square Dashboard and navigate to Items on your left menu.
2. On the new page, scroll to the bottom of the left menu and select Settings.
3. On the expanded left-hand side menu, click Inventory.
4. You will find the Inventory Tracking option there. Please toggled this on. 
5. Once the Toggle is active, you'll see the button below it activate, go ahead and click Enable for all existing items.
6. A Pop-up will ask you to confirm the action, so do it by clicking Enable Tracking .
Now all existing items on your Square POS will have numerical stock quantity attached to it and all items you add going forward will do too.
Your next step is to adjust your Square stock quantities to what you have on hand, which may require a physical count.
You can do that through the individual product page on Square or in bulk depending on your Square plan and if you have a barcode scanner. You can check Square's options for inventory additions and adjustments here.
More Resources
Square Support: Track Your Inventory with Square for Retail