GraphQL get product variant quantity

Hello Karl, On a similar issue,

I use the Storefront API [end point api/2019-07/graphql.json]

I’m able to query my products in different ways, also using productByHandle, but for some reason i’m not able to use productVariants query like for example:

productVariants(first:1, query: “sku:BMY722”). I get an error that its not exists under QueryRoot.

Any idea what could be the probable reason for this ?

Thank you

Ziv