I updated from original X to pro. I or tried the following
1.) registered pro have the latest version
2.) disabled all plugins to see if it was a problem
3.) have typekit installed and the custom fonts loaded
4.) Have website registered on typekit console.
I have followed all instructions and it still only shows google and system fonts in the customizer. It wont load the typekit fonts. I have also disabled and reenabled the plugin and theme to see if maybe it was some sort of refresh or cache.