On iOS devices (iPhones, iPads) Audio Blocks detect that iOS is being used and they default to the built-in iOS player that opens on a new page.
You should be able to stop this by using some code to tell the Squarespace Audio Block that the visitor is not using iOS. This should prevent the block attempting to invoke the built in iOS player. To do this, add the following script to Settings > Advanced > Code Injection > Footer:
<script>
window.addEventListener("load", function(){
Y.UA.ios = 0;
})
</script>
Note: This was tested on a Squarespace 7.1 site running Safari on iOS 15.
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