Unity Discussions button in the Hub opens a non-existent page ("Oops! That page doesn't exist or is private")

Steps to reproduce:

1. Open the Unity Hub
2. Click on the profile icon to open additional settings
3. Click the Unity Discussions button
4. Observe the page that opens in the browser

Actual results: The browser opens https://discussions.unity.com/tag/unity-hub, which shows "Oops! That page doesn't exist or is private."

Expected results: The button opens an existing Unity Discussions page for Hub topics

Reproducible with versions: 3.20.0, 3.21.0

Tested on (OS): Ubuntu 24.04, macOS 26.5