curl --request DELETE \
  --url https://api.kit.com/v4/bulk/tags \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "tags": [
    {
      "id": 91
    },
    {
      "id": 92
    }
  ]
}
'

{
  "failures": [
    {
      "errors": [
        "Tag does not exist"
      ],
      "tag": {
        "id": 91
      }
    }
  ]
}