For new subscribers only.
The offer, available in the USA and UK but not in Australia, features your first month of Xbox Game Pass Ultimate for $1 USD, followed by a recurring subscription price of $14.99 USD a month. In addition to access to the Xbox Game Pass programs for both console and PC, the subscription will add on 6 months of the ad-free Spotify Premium.
As with many offers of this type, the 6 months of Spotify is only available to new subscribers of the Xbox Game Pass Ultimate program. Too bad if you’re already a member!