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To enable a developer to test a custom app in Microsoft Teams, configuring an app setup policy that specifically applies to the developer is the most effective action. This is because app setup policies determine which apps are pinned and accessible in the Teams client for individual users or groups of users.

By creating a targeted app setup policy for the developer, you grant them quick and organized access to the custom app they are developing. This approach allows the developer to have the flexibility to test the app in their own environment without affecting other users. It ensures that only the designated user has the policy applied, which helps maintain a clean and manageable interface for other team members who may not require access to the testing application.

The other options do not directly serve the need for individualized access to the app for testing purposes. Modifying the global app setup policy would apply changes to all users in the organization, which is unnecessary and could disrupt the app experience of other users. Adjusting the global app permission policy would affect what apps are allowed or restricted across the organization, but not specifically facilitate a developer's testing requirements. Similarly, while configuring an app permission policy that applies to the developer only would control permissions related to the app itself, it wouldn't address the necessary setup required for the app to be