CORS error while trying to post data with Axios on AWS REST API configuration using a node.js Lambda function

I’m posting data to a DynamoDB table with axios in a React front-end.
The API is set up through a serverless configuration with an API Gateway and Lambda on AWS.

While the request goes through and I see the added item on the database I still get a CORS error https://i.stack.imgur.com/m7yMG.jpg

This is the axios method:

import axios from "axios";

export const sendItemToDB = async (_data) => {
    if (!_data) { return };
    try {
        const res = await axios({
            method: "POST",
            url: process.env.REACT_APP_QUERY_API,
            data: _data,
            headers: {
                "Content-Type": "text/plain"
            },
        });
        console.log("data returned from api", res);
    } catch (error) {
        console.log("Error sending File to db: ");
        console.log(error);
    }
};

And the API method on Lambda:

const createRecord = async (event) => {
    const response = { statusCode: 200 };

    try {
        const body = JSON.parse(event.body);
        const params = {
            TableName: process.env.DYNAMODB_TABLE_NAME,
            Item: marshall(body || {}),
        };
        const createResult = await db.send(new PutItemCommand(params));
        response.body = JSON.stringify({
            message: "Successfully created record.",
            createResult,
        });
    } catch (e) {
        console.error(e);
        response.statusCode = 500;
        response.body = JSON.stringify({
            message: "Failed to create record.",
            errorMsg: e.message,
            errorStack: e.stack,
        });
    }

    return response;
};

I based this configuration on this tutorial : https://github.com/jacksonyuan-yt/dynamodb-crud-api-gateway