Trying to update sharepoint library metadata column using pnp js

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Observed Behavior

pnp.sp.web.lists.getByTitle("ListName").items.getById(1).update({ Title: Title, DeptDiv://internal name of list column { __metadata: { "type": "SP.Taxonomy.TaxonomyFieldValue" }, Label: Department1,//value to be updated TermGuid: "**", WssId: -1, } }).then(r => {

console.log(r);

});

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SharePoint / PnP-JS-Core