Viva Learning is not a free offering within Office 365; it has a per-user cost of $4 to $12.
Viva Learning is a centralized learning hub in Microsoft Teams that lets you seamlessly integrate learning and building skills into your day. In Viva Learning, your team can discover, share, recommend, and learn from content libraries provided by both your organization and partners. They can do all of this without leaving Microsoft Teams. For more details about its description, you could refer to:
https://video2.skills-academy.com/en-us/viva/learning/overview-viva-learning
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