Hello everyone. We are trying to set up some web pixels using Google Tag Manager using the new "Customer Events" functionality of Shopify on a store already in the new checkout. However, we are getting an error only happening on the checkout page. As soon as the script is executed, it returns this: Uncaught DOMException: Blocked a frame with origin "null" from accessing a cross-origin frame. I'm attaching a screenshot of the error for full context.
Any idea of why this might be happening? If I remove the GTM script, everything works fine. So it must be something related to the external script. I'll appreciate any help, thanks in advance!