font awesome icon is not appearing in IE 11, but showing in other browsers

I had the same issue, I solved it by adding this meta tag as the FIRST tag in <head>:
<meta http-equiv="X-UA-Compatible" content="IE=edge">

Also, according to the official documentation, check the following:

For Internet Explorer: you don’t serve files with no-store option in Cache-control header (Ref: #6454);
For Internet Explorer and HTTPS: you don’t serve files with no-cache option in Pragma header.

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