vis-network: Fontawesome 5 icon not getting render on network

I am using the network of Vis.js, previously for icon fontawesome 4.x was working fine, but after updating the fontawesome version to 5.x it’s giving a problem. I changed the icon code too, but still is not rendering the icon properly, I used the icon: {face: "Font Awesome 5 Free", code: "\ufbb", color: "#6cf7a2", size: 30} code for fontawesome and the output is following: