Shopify Storefront API error Delegate Access Token

Solution:

Ok, so I figured it out. I don't actually want a delegateAccessToken to create a user but to have a Storefront API Access Token. This may get a bit confusing but you use your Admin Access Token to request a storefront access token like so (I use graphql-request on npm):

 const accessToken = gql`mutation storefrontAccessTokenCreate($input: StorefrontAccessTokenInput!) {
    storefrontAccessTokenCreate(input: $input) {
      shop {
        id
      }
      storefrontAccessToken {
        accessToken
      }
      userErrors {
        field
        message
      }
    }
  }`

  const accessTokenVars = {
    "input": {
      "title": "my-access-token"
    }
  }

  const queryAccessTokenData = await adminGraphQLClient.request(accessToken, accessTokenVars);
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From here you now have a Storefront Access Token and can make a call via Oauth to create a customer like so:

const shopifyUserQuery = gql`mutation customerCreate($input: CustomerCreateInput!) {
    customerCreate(input: $input) {
      customer {
        id
        firstName
        lastName
        acceptsMarketing
      }
      customerUserErrors {
        field
        message
        code
      }
    }
  }`

  const shopifyUserVars = 
  {
    "input": {
      "firstName": values.firstName,
      "lastName": values.lastName,
      "email": values.email,
      "password": values.password,
      "acceptsMarketing": false,
    }
  }

  // We need to switch the default storefront headers over to our private API key
  sfGraphQLClient.headers = {
      'X-Shopify-Storefront-Access-Token': queryAccessTokenData.storefrontAccessTokenCreate.storefrontAccessToken.accessToken,
      'Content-Type': 'application/json'
  }

  const shopifyCreateCustData = await sfGraphQLClient.request(shopifyUserQuery, shopifyUserVars);
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This will now create the user using the Storefront API.