Well, I think the problem is with your font location. I’m assuming that the bundled css virtual location /BundleStyles/css doesn’t actually exist. and if your folders structure like below
Content > Font
Content > style
If this is true, then try this
change /BundleStyles/css to /Content/css
<link href="https://stackoverflow.com/Content/css?v=pANk2exqBfQj5bGLJtVBW3Nf2cXFdq5J3hj5dsVW3u01" rel="stylesheet"/>
and reference your font like this
src: url('Fonts/ProximaNova/ProximaNova-Bold.otf')
in this case your font will be loaded relative to the “css” file which is located inside the content folder which also contains the “fonts” folder
If what I assumed is incorrect please show us how you structured your files