The following steps will help you configure your SCUF Vantage controller to be detected properly in Steam.
Step 1: Launch Steam
Step 2: Navigate to Steam > Settings > Controller > General Controller Settings > Check the “PlayStation Configuration Support” checkbox. Your Vantage controller will be listed under Detected Controllers as “PlayStation 4 Controller : PlayStation 4 Controller”
Step 2 (a)
Step 2 (b)
Step 3: To ensure your controller is correctly identified- select your controller under the “Detected Controllers” list and select “Identify” while holding your controller. Your controller will vibrate briefly whenever “Identify” is selected.
Step 3 (a)
Step 3 (b)