If you do make a purchase through CDKeys, you can expect a code to be sent to you by email. Redeem that Game Pass code on your Xbox or through Microsoft's website to enjoy your Ultimate membership ...

Walmart+ subscribers can redeem the free code alongside their subscription, rewarding two months of Game Pass Ultimate.

You can then angle for at least one bonus month by choosing recurring billing when you redeem each Xbox Game Pass Core code. (YMMV, Microsoft has become inconsistent with this bonus offer.) ...

In the shop category, you can redeem points for Xbox gift cards, Xbox Live Gold subscriptions, and even Game Pass Ultimate subscriptions. You can also get digital gift cards to a number of places ...

If you're on Game Pass Core, it should be fine to apply to your account. Otherwise, if you're a current Game Pass Ultimate member, the code won't be applicable.

There are so many more benefits to subscribing to Xbox Game Pass Ultimate. One of which is one of the more underappreciated aspects of the service — Xbox Game Pass Ultimate Perks.