Look for a DVS Token (a unique code printed on a card or manual in the box).
Some audio tech YouTubers or industry influencers (like those from ProTools Expert or Audio Brewers ) occasionally run giveaways sponsored by Audinate. Winning one of these gives you a legitimate, free license key. This is the closest thing to an "exclusive free license key" that actually exists. dante virtual soundcard free license key exclusive
Audinate Dante Virtual Soundcard PRO Software Token (1-Year) Look for a DVS Token (a unique code