onSuccess callback in Plaid Link not updating

I've built a PlaidLink component using react-plaid-link as below. There's no issues when building with the standard way - passing in only public_token and account_id to the request body.

However, when I attempt to pass in stripeUid to the request body, only an empty string (the initial value of the stripeUid state) is passed. This is despite the value of stripeUid being updated and passed in correctly from the parent via props. For some reason stripeUid does not update within the useCallback hook even though the value is in the dependency array.

Any idea why the value is not updating?

function PlaidLink(props) {
  const [token, setToken] = useState("");
  const { achPayments, stripeUid } = props;

  async function createLinkToken() {
    const fetchConfig = {
      method: "POST",
    };
    const response = await fetch(
      API_URL + "/plaid/create-link-token",
      fetchConfig
    );
    const jsonResponse = await response.json();
    const { link_token } = jsonResponse;
    setToken(link_token);
  }

  const onSuccess = useCallback(
    (publicToken, metadata) => {
      const { account_id } = metadata;

      // Exchange a public token for an access one.
      async function exchangeTokens() {
        const fetchConfig = {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({
            public_token: publicToken,
            account_id,
            stripeUid,
          }),
        };
        const response = await fetch(
          API_URL + "/plaid/exchange-tokens",
          fetchConfig
        );
        const jsonResponse = await response.json();
        console.log("Exchange token response:", jsonResponse);
      }

      exchangeTokens();
    }, [stripeUid]
  );

  const { open, ready } = usePlaidLink({
    token,
    onSuccess,
  });

  // get link_token from your server when component mounts
  useEffect(() => {
    createLinkToken();
  }, []);

  useEffect(() => {
    if (achPayments && ready) {
      open();
    }
  }, [achPayments, ready, open]);

  return <div></div>;
}

export default PlaidLink;