If a product can’t be found by searching for the product's SKU, please make sure that the latest version of the extension is installed.
If the product is still not coming up in the search results on the latest version of the extension, please confirm that the SKU is set as a searchable attribute. This can be checked in the Algolia configuration in the Magento admin by navigating to Stores > Configuration > Algolia Search > Products. You can find more information on this setting here.