Canceling a User's Subscription with an API Call

Canceling a User's Subscription with an API Call

I am having been following the API guide at https://www.zoho.com/campaigns/help/api/contact-unsubscribe.html
and have difficulty understanding what is going wrong with my implementation.  I am testing the call on a local server (Rails backend) and am getting the following response error (listkey and authtoken are removed from this example):

ZOHO_CAMPAIGNS = Faraday.new("https://campaigns.zoho.com/api/xml/",
    params: {
      authtoken: AppConfig.zoho.api_key,
      scope: "CampaignsAPI",
      # listkey is for the "test test" mailing list
      listkey: "-----"
    }
  )

def unsubscribe_user(user)
      remove_subscription = ZOHO_CAMPAIGNS.post do |req|
        req.url "listunsubscribe"
        req.params["contactinfo"] = "<xml><fl val='First Name'>#{user.first_name}</fl><fl val='Last Name'>#{user.last_name}</fl><fl val='Contact Email'>#{user.email}</fl></xml>"
      end.body

      xml = Nokogiri::XML remove_subscription
      xml.search("FL[val='Id']").text
end

Request:  
#<struct Faraday::Request method=:post, path="listunsubscribe", params={"authtoken"=>"-------------------", "scope"=>"CampaignsAPI", "listkey"=>"------------------------", "contactinfo"=>"<xml><fl val='First Name'>best</fl><fl val='Last Name'>test</fl><fl val='Contact Email'> best@test.com</fl></xml>"}, headers={"User-Agent"=>"Faraday v0.11.0"}, body=nil, options=#<Faraday::RequestOptions (empty)>>

Response:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<response uri="/api/xml/listunsubscribe" version="1">
  <code>IAMError%3AZ101%3AISCSCOPE_MISMATCH</code>
  <status>error</status>
  <message/>
</response>


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