Making call with ?additional-fields[profile]=subscriptions not subscribing users

I am creating a call via = https://a.klaviyo.com/api/profiles?additional-fields[profile]=subscriptions

With the body as follows -- the profile is being created but not subscribed. What am I doing wrong? How can I subscribe the user to a specific list too with this call?

data: {
        type: "profile",
        attributes: {
          email: email,
          properties: {
            signup_date: created_at,
          }
        },
        subscriptions: {
          email: {
            marketing: {
              can_receive_email_marketing: true,
              consent: "SUBSCRIBED",
              consent_timestamp: created_at
            }
          }
        }
      },