After opening issue on woocommerce github page and authors reaction.
The solution is
wp wc product create --name="Product Name" --categories="[ { "id" : 21 } ]" --user=admin
After opening issue on woocommerce github page and authors reaction.
The solution is
wp wc product create --name="Product Name" --categories="[ { "id" : 21 } ]" --user=admin