Challenge with productUpdate in Admin API (GraphQL) adding Tags to Product

[RobinKZ]

Hi, I'm trying to add some tags to a product via productUpdate and I'm running into the problem that no matter what I pass is doesn't fail but the tags are not updated.

I'm sending this:

mutation {
    productUpdate(input: {
      id: "gid://shopify/Product/${id}", 
      title: "${data.title}", 
      descriptionHtml: "${data.descriptionHtml}",      
      metafields: [{
        key: "mainmaterial",
        namespace: "my_fields",
        value: "${data.metafields.mainmaterial}"
      }],
      tags: ["Hest","Fisk"]
    }) {
      product {
        id
        descriptionHtml
        images(first:50) {
          edges {
            node {
              id
              src
            }
          }
        }
        tags
        metafields(first:10) {
          edges {
            node {
              namespace
              key
              value
            }
          }
        }
      }
    }
  }

And I'm getting this in return:

{
  id: 'gid://shopify/Product/7214229487809',
  descriptionHtml: '...',
  images: {
    edges: [
      [Object], [Object],
      [Object], [Object],
      [Object], [Object],
      [Object], [Object],
      [Object], [Object],
      [Object], [Object],
      [Object], [Object],
      [Object]
    ]
  },
  tags: [],
  metafields: { edges: [ [Object] ] }
}

As you can see "tags" returns blank and I've confirmed in the admin section on the product that no tags have been added.

I've tried:

tags: ["Tag1, Tag2, Tag3"]

tags: ["Tag1","Tag2","Tag4"]

tags: "Tag1, Tag2, Tag3"

tags: "[\"Tag1\", \"Tag2\", \"Tag3\"]"

Nothing seems to take and I don't get any error messages, except for the bottom one.

Any help is appreciated.

[RobinKZ · Accepted solution]

Problem was related to Metafields and not tags at all. The problem was I was not passing the ID of the metafield so it thought I wanted to create the same metafield over and over again, instead of getting an error message it just ignores updating the entire object.