Out-of-the-box, the Customer Group Catalog module allows enabling rules to cover out-of-stock products. To explicitly include out-of-stock items in your customer group catalog rules, use either of these options:
Option 1: Use the Apply to Out of Stock Products setting.
Go to Customers > Customer Group Catalog > Rules, select (edit) the rule you want to modify and navigate to its Products section. Here you’ll find the Apply to Out of Stock Products setting. Enable it to ensure the rule applies to products which have the Out of Stock status:
Option 2: Configure the product status condition.
To apply the rule to the out-of-stock products, you may add the condition based on the stock status. For that, follow the steps below:
1. Go to Stores > Attribute > Products and edit the quantity_and_stock_status attribute.
2. In the attribute settings, locate the Storefront Properties section and set Use in Promo Rule Conditions = Yes:
3. After saving the attribute, navigate to your customer group catalog rule and add the Quantity is Out of Stock line to the rule conditions:
If you have questions about configuring these settings, do not hesitate to contact our support team.