Has anybody successfully configured Fulfillable Inventory?

While reading through the Winter '24 Editions, I came across two different mentions of fulfillable inventory.

https://help.shopify.com/en/manual/shipping/setting-up-and-managing-your-shipping/fulfillable-inventory

However, I’ve been unable to get this feature to show up for me. I’ve configured my shipping profile according to the requirements and enabled Checkout Extensibility.

I created a ticket with Shopify Plus support but haven’t received any help thus far.

Has anybody been able to get this feature to work?

It turns out that Shopify Plus support was able to get it to display for me.