Following Platform modules are not installing when "Install with Unity Hub" button is selected from Build Settings window
iOS
Android
WebGL

Steps To Reproduce:
1. Create a New Project
2. Select File > Build settings > iOS > Install with Unity Hub.

Actual Result:
Selecting "Install with Unity Hub" Platform modules are not installing and directs to Unity Hub where it prompts Message "Unity2020.2.0a8 is already installed on your machine"

Expected Result:
Platform modules are installed when "Install with Unity Hub" is selected

Occurring on:
2019.4.0f1, 2020.1.0b10, 2020.2.0a8

Environment:
Windows 10 and macOS 10.15

Note: The feature to install modules via Unity Hub from Unity was introduced in 2019.4.0f1, 2020.1.0b10, 2020.2.0a8,
The feature to install modules via Unity Hub not available on 2018.4.24f1.

Workaround:
1) Open Unity Hub
2) Installs > Click the burger menu of the Unity version to add module support
3) Add Modules