How to fix Memberstack subscription buttons that work locally but fail on other computers in WordPress?

Hello,

On a WordPress site, I installed the Memberstack extension, linked my App ID, and placed buttons to update or subscribe on my site, but when I click on these buttons, it does not work except on my computer using Chrome, but on no other computer.

The site in question ishttps://coeurlocal.fr/

Here is the code used for the buttons: 

<div class="wp-block-button has-custom-width wp-block-button__width-100 is-style-fill">
  <a 
    class="wp-block-button__link has-small-font-size has-text-align-center has-custom-font-size wp-element-button" 
    href="javascript:void(0)" 
    style="border-width: 24px; border-radius: 20px; padding-top: var(--wp--preset--spacing--30); padding-bottom: var(--wp--preset--spacing--30); opacity: 1; pointer-events: auto;" 
    rel="noopener"
    data-ms-price:update="prc_pack-mensuel-pwod0us2"
    data-ms-redirect="https://coeurlocal.fr/add-listing/places/">
    Formule Mensuelle <em>9,90 <strong>€</strong> HT / mois sans engagement</em>
  </a>
</div>