Install: npm i nodebb-plugin-sso-steam-v2
THIS PLUGIN IS NOT BACKWARD COMPATIBLE WITH THE OLD VERSIONS
This plugin was modified from nodebb-plugin-sso-steam-refactor since it's author seems to be ignoring the repo and various issues it has. This version includes various fixes and improvements that are listed on github.
Once you've installed/enabled the plugin and restarted make sure to head to YOURFORUMHERE/admin/plugins/sso-steam and enter your steam API key.