Which sharing option should Team Managers with Customer Community Plus licenses use to access all cases within their account?

The sharing option that allows Team Managers with Customer Community Plus licenses to access all cases within their account is the Sharing Set. Sharing Sets are specifically designed to provide access to records based on the relationship between a user and the record. In the case of Customer Community Plus users, Sharing Sets enable them to share records such as cases more effectively without the need for complex sharing rules or manual intervention.

With Sharing Sets, you can define a set of records—like cases—that are associated with the user's account. This means that any cases tied to the users' accounts can be accessed seamlessly, providing Team Managers the visibility they need to manage their cases and collaborate with other users efficiently.

In contrast, the other options would not effectively facilitate the desired access level for Team Managers. For instance, Opportunity Team is focused on sales opportunities rather than cases and wouldn’t apply to the case-related access required here. Group Access relates to the visibility and access for groups but lacks the individual-specific record sharing that Sharing Sets provide. Lastly, Manual Sharing requires administrators to share records individually, which can become cumbersome and inefficient for accessing multiple cases. Thus, relying on Sharing Sets streamlines this process for Team Managers within the context of their licensing and the needs of their roles.