PenciDesign Supporter replied
Staff Reply
Hi,
Please go to Appearance → Customizer AMP → Penci AMP → Header → Add Custom Code Inside <head> Tag: add the following code
<script async custom-element="amp-accordion" src="https://cdn.ampproject.org/v0/amp-accordion-0.1.js"></script>
Then clear all the site cache & wait for Google to index your site content again.
Regards,
PenciDesign.