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For testers to access releases in a private distribution group, signing in to their App Center account is essential. This requirement ensures that only authorized users who are part of the designated distribution group can access the software or application releases. The use of an App Center account links testers to their assigned roles and permissions, thereby maintaining security around the distribution of apps.

When testers log in, the App Center verifies their identity and permissions, allowing them to view and download the releases they are authorized to access. This authentication process promotes a controlled testing environment, where sensitive information and unreleased versions of software are protected from unauthorized access.

In contrast, other options do not provide the necessary security or access control mechanisms suited for a private distribution environment. Entering an access code could imply a more complicated process than required, while requesting temporary access may not align with the immediate availability typically provided through an existing account. Lastly, using a public link contradicts the notion of a private distribution group, where confidentiality and restricted access are paramount.