This helped get mine working (1.79.2): Open up your JSON settings (on Mac, cmd + shift + p and type in 'Preferences: Open User Settings JSON') and make sure the following is present:
"emmet.triggerExpansionOnTab": true,
"emmet.showSuggestionsAsSnippets": true,
"emmet.showExpandedAbbreviation": "always",
"files.associations": {
"*html": "html",
"*njk": "html"
},
"emmet.useInlineCompletions": true,
"emmet.optimizeStylesheetParsing": false,
"emmet.includeLanguages": {
"javascript": "javascriptreact",
"typescript": "typescriptreact",
"vue-html": "html",
"vue": "html",
"razor": "html",
"plaintext": "pug",
"django-html": "html"
},
Restart VSC and should be working. Alternatively, in the extenstions tab, you can type '@builtin emmet' to make sure the extension is enabled.