Open Marketplace button is unresponsive

When pressing the Open Marketplace button in UE5 or the Marketplace button in UE4, nothing happens. This occurs in both UE5 Early Access and UE4 4.26.2.

Tested in //UE4/Release-4.25 @ CL 14469661 and this did not occur, so marking as a Regression.

1. Open any project
2. In the Toolbar, navigate to Content
3. Select Open Marketplace

RESULT:

The Unreal Engine Marketplace does not open in the launcher

EXPECTED:

The Epic Games Launcher comes into focus and opens the Marketplace tab