Getting `invalid id` on `cartLinesUpdate` storefront mutation

Hydrogen and Storefront APIs
1

Here’s my code,

mutation mutateCart {
  cartLinesUpdate(
    cartId: "gid://shopify/Cart/Z2NwLXVzLWNlbnRyYWwxOjAxSkpLSFhZU05RODAxWEg1VlBIODA0OVIw"
    lines: [{id: "gid://shopify/CartLine/8d9cf56b-3645-4ebb-82be-ceaa78d2b428", quantity: 3}]
  ) {
    cart {
      id
    }
    userErrors {
      code
      field
      message
    }
  }
}

I obtained line id using,

query getCart {
  cart(
    id: "gid://shopify/Cart/Z2NwLXVzLWNlbnRyYWwxOjAxSkpLSFhZU05RODAxWEg1VlBIODA0OVIw?key=1564244d987c0d134602122a8afbc9b1"
  ) {
    lines(first: 250) {
      edges {
        node {
          id
          quantity
          merchandise {
            __typename
            ... on ProductVariant {
              id
              product {
                id
              }
            }
          }
        }
      }
    }
  }
}

What am I doing wrong here?