InvalidCaptchaError: Submit failed due to invalid reCaptcha

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On my page, I have a contact form with Captcha verification. I’ve followed the Wix Velo Captcha tutorial very closely, but I still get the following console errors:

InvalidCaptchaError: Submit failed due to invalid reCaptcha

Error processing captcha submission: Error: Request failed with status code 400

Front end page code:

import wixData from 'wix-data';
import wixWindow from 'wix-window';
import { processSubmission } from 'backend/submitHandler';

export function btnSubmit_click(event, $w) {
    
    let token = $w("#captcha").token;

    processSubmission(token)
        .then(() => {
            // ...
        });
    
}

export function captcha_verified() {
    $w('#btnSubmit').enable();
    $w('#txtMessage').hide();
}

backend/submitHandler.jsw

import wixCaptchaBackend from 'wix-captcha-backend';

export function processSubmission(token) {
    return wixCaptchaBackend.authorize(token)
        .catch((error) => {
            console.log("Error processing captcha submission: " + error); // Error called every time
        })
}

If this is literally the same code from the Velo tutorial, why am I still getting these errors?