Theres a new course on The Expert Zone Portal for a free 6 months M365 family code that is stackable up to 5 years. The Accreditation course is called Windows Essentials. It took me less than 20 minutes to go through it and ends with a Quiz that you can retake until you pass with a pass score of 80%. The portals saved me and my family (you can share the subscription with up to 5 other members for 6 total including you as the main holder) a small bundle of money.
Its best to complete early in the week as the Rewards team likely dont approve the credit over the weekend.
This is the site: https://expertzone.microsoft.com/about
You will need to be either a retail (Microsoft store, staples etc) / Enterprise/ Partner employee to be eligible for rewards as these are courses designed to inform on how Microsoft products fit customer requirements.