ERROR: Mailchimp API error: 404 Not Found.

Hi – I am trying to get our sign up link to work via our wordpress website using MC4WP plugin and the following error keeps ocurring.

[2022-02-04 13:13:37] ERROR: Form 434 > Mailchimp API error: 404 Not Found. Resource Not Found. The requested resource could not be found.
Request:
POST https://us6.api.mailchimp.com/3.0/lists/967716b5d5/members
{“status”:”subscribed”,”email_address”:”seon***@so*****.co.uk”,”interests”:{},”merge_fields”:{},”email_type”:”html”,”ip_signup”:”86.186.233.135″,”tags”:[]}
Response:
404 Not Found
{“type”:”https://mailchimp.com/developer/marketing/docs/errors/”,”title”:”Resource Not Found”,”status”:404,”detail”:”The requested resource could not be found.”,”instance”:”c4d043b2-116c-995c-a5bd-86e31c9be3b1″}

This is the form code I am using:

<div class=”ova_mailchimp”>
<div class=”info”>Sign up to our latest news</div>
<input type=”email” name=”EMAIL” class=”email” placeholder=”Your email address” required /><input type=”submit” value=”Sign up” class=”submit” />
<div class=”list”>
<label>List choice</label>
<label>
<input name=”_mc4wp_lists” type=”radio” value=”967716b5d5″ required=””
checked=”true”> <span>Web</span>
</label>
</p>
</div>
</div>

The page I need help with: [log in to see the link]