Internet Explorer 11 - Ajax Call Not Firing

I am stuck in the middle of a bug. I began to use BrowserStack to validate my current project against Windows IE and EDGE and I got a particular issue with IE 11. I first got an is

Solution 1:

My issue here was that I needed to override my call to different e.preventDefault() by e.preventDefault ? e.preventDefault() : ( e.returnValue = false );

Which is better supported on IE.

Got this information from the following post : event.preventDefault() function not working in IE

Then I got aditionnal issues with the Event and CustomEvent class not properly supported so I added a few polyfills by adding Babel Transpiler to avoid using ES2015 but compatible JS.

Still having some issues with supporting IE 11 completely but this one is fixed.