Just got an email from Chase (United Explorer card) offering 6 months of free Spotify Premium for new users. I clicked through and used a new email address that I hadn't used with Spotify before, but still got a message saying that I'm ineligible
New Users: Get 6 months of SpotifyŽ Premium free
Enroll for a subscription with audio streaming service Spotify Premium by 9/30/20.
We'll reward you with your first 6 months free and then a 5% monthly statement credit for 6 months.
Existing Users: You're invited to activate a 5% monthly statement credit for 6 months