Form not rendering after update AMP from version 0.9.98.8 => 1.0.18

On the page, at the bottom, there was a single field form for subscription.
After update the amp, Form is not rendering and only Green box is visible.

Below is the code from the admin -> widget panel -> AMP footer -> Custom HTML

<div class="amp-sticky" id="amp-subscription">
<span class="amp-sticky-close" on="tap:amp-subscription.hide"><span>close</span></span>
<form class="mailchimp-subscription-form" 
  method="POST"
  id="mailchimpsubscriptionform"
  action-xhr="https://thegreenfund.com/wp-json/xxxx/v1/xxxxx"
  target="_top"
  custom-validation-reporting="show-first-on-submit"
>
<h5 class="amp-subscribe-head">Learn More. Reach New Highs...</h5>
<div class="form-group email-subscription">
<div class="form-field">
<input name="formData[name]" value="Investor" type="hidden">
<input autocomplete="off" type="text" name="formData[email]" placeholder="My email address is..." />
<button type="submit"><i class="icon-send"></i></button>
</div>
</div>
<input type="hidden" name="ampForm" value="amp">
<div submitting>
<template type="amp-mustache">
Please wait...
</template>
</div>
<div submit-success>
<template type="amp-mustache">
{{message}}
</template>
</div>
<div submit-error>
<template type="amp-mustache">
{{message}}
</template>
</div>
</form>
</div>

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