Microsoft offers Special Partner offers for those who have an active subscription of Microsoft 365. Giving you more for your money.
You can read about these offers, and how they work, in this blog post.
What are Partner rewards
Microsoft has partnered up with their partners, like Adobe, and are offering subscriptions for their products and services for a limited time. These include subscriptions for Headspace, CreativeLive, Adobe and more.
These offers are only available for Microsoft 365 subscribers with family or Personal subscription. These offers will update with latest offers available from their partners. These rewards put together are more than $300 worth of subscriptions
How to redeem these offers
To redeem these offers, you will need to navigate to this site:
https://www.microsoft.com/partner-benefits

When you redeem these offers, they will take you to a page on their site, which will have the product key visible. All you need to do is hit submit/OK and the subscription will be added onto your account.
These codes are only available for a limited time. Once the offer has ended, latest offers will take their place allowing you to try something new. These offers do not cost you money, and the subscription can be cancelled at any time. You just need to make sure that you turn off the auto renewal from the partners website.