When users who qualify for the Teams Exploratory Experience sign up, they will be automatically assigned licenses and the tenant administrator will receive an email notification when someone in the organization launches the Teams Exploratory Experience for the first time.
Here are the conditions of the Teams Exploratory Experience:
· Have a managed Azure AD domain email address.
· Belong to a tenant with a paid subscription.
· Don't have an active Teams license.
· Aren't in a tenant where a license assignment policy was created.
Teams Exploratory is available as a 12 month subscription (from initial user sign-up) for all new customers. The new Teams Exploratory subscription starts when the first user in an organization signs-up for Teams Exploratory and it will expire after 12 months.
If you want more details, you may refer to the article.
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