Thanks for the reply it didn't work then I realized in the network tab content-type for the font returns application/octet-stream However in the head I declare type as a font/woff2 Could it be the reason?  

I watched the video and applied exactly the same solution. It's just a one liner code, there is no chance to make error, but didn't work.

According to the Lighthouse report, fonts should be preloaded because they increase the number of chaining critical requests.I followed the instructions and added a link to html file as: (while trying to figure out what can be causes to this issue, i tried the same font with multiple paths just to b...