On the bottom right of your Sublime screen you can click on it to choose the application. When my Html + Tab quit working, it was because it had somehow changed to Text mode. I flipped it back to HTML and it is now working fine.
Someone here says type ! then press (tab) and that really works for everyone problem solve thanks dude who says that
Hello. It works just fine on Sublime Text 3. Change the extension to html (on the right-most corner below). Then type in <html and press tab.
just type ! sign and hit enter