If you want to use Unity 2020LTS with SteamVR you need a couple of additional steps to do:

1. Download and install SteamVR plugin from here: https://github.com/ValveSoftware/steamvr_unity_plugin
2. Install the default input by going in window/steamVR Input -> Save and Generate
3. Install Explore 1.4.4+
4. Open the Explore panel from Tools/Archtoolkit/AT+Explore
5. Apply SteamVR build template in the Build panel If you’re not able to see your controllers just apply the template again.