Update Variation Local Option localized

[FabPari]

Hi dear, is there a way for update variation local option name?
I try to get variations, change the attribute option (where I found text ), and update, but don't work

`
v = wc.Product.Variations.Get(variant, (int)plang.id).Result;

v.attributes[0].option = "test";

var a = wc.Product.Variations.Update((int)v.id, v, (int)plang.id).Result;
`
but don't work, any idea?
Thanks
Fabio