Once installation is complete, select Launch Immerse Gamepack Final Fantasy XIV to activate your license or free trial. Scan the QR code to begin creating your personalized HRTF profile. After you've submitted your ear picture and your personalized audio profile creation is complete, return to FFXIV, and to enable Immerse Spatial Audio, please follow the below steps:
Step 1: Click on Start --> System Configuration --> Sound Setting --> Spatial Audio.
Step 2: Check the box 'Enable Spatial Audio' to complete the setup, and you see the message 'Immerse Spatial Audio is on,' click on 'Apply.'
You can also refer to this link for the setup guide.
Congratulations, you're ready to play Final Fantasy XIV with fully personalized 360 spatial audio. We hope you enjoy your new adventure.