This article provides context about the common Product warning "Missing Field: priceValidUntil". This is a common, and oftentimes expected warning.
Background and Intention: priceValidUntil
The intention of priceValidUntil is to signal that a Product Offer is only available for a limited period of time, typically for a sale. If the product is not on sale, there's no way to get the end date value to satisfy the priceValidUntil property. Since Google's Product Feature Guidelines state that this is only a recommended property, missing this information will not impact eligibility for rich results in search.
Adding Sale Information to Address priceValidUntil Warnings
You can add sale information in the backend of your Product management system.
WooCommerce Products
The priceValidUntil property is only shown in WooCommerce when a sale has been scheduled. This means a value must be given for both "Sale price", and the Sale price "from" and "to" dates.

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