Why a product is sold out or cannot be ordered

Start by identifying whether the product is missing, visible but sold out, or available until the customer chooses a date.

1. Missing from the shop: open the product and check Listed status, Draft, category and Add-on Only Product. Unlisted products can still be used in presales. With Show All Published Products in Shop, they may appear as presale links or previews; archived/draft products remain hidden from customers.
2. Visible but sold out: check Stock Management → Track Main Product Stock → Product Stock. Then check required variation-option stock and its assigned Order Pool. Any one of these can be the limiting factor.
3. Bundle sold out: inspect component quantities and stock, required component options and component pools. The bundle cannot be made if a required component is unavailable.
4. Only one date unavailable: inspect daily product/pool counts and that date's Calendar rules. Daily capacity is specific to the fulfillment date.
5. Presale product unavailable: open the presale's product/option/component limits, its Inventory Pools, and the selected window's Max Orders. Regular product stock does not supply those presale limits.
6. Stock is available but ordering is not: check direct checkout and fulfillment options, then follow the checkout availability checklist.

There is no product-level Sold Out status to turn off. Fix the limiting stock or rule, save, and try the same quantity/options/date as the customer. Increasing only main stock will not fix an exhausted required option or shared pool.