The correct action to ensure that guest access to Project1 content expires automatically after 90 days is to configure the External sharing settings in the SharePoint admin center.

 The correct action to ensure that guest access to Project1 content expires automatically after 90 days is to configure the External sharing settings in the SharePoint admin center.

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Explanation

While guest access is managed in multiple places (Teams, Microsoft 365 Groups, and Microsoft Entra ID), the specific setting to automatically expire access for guests on a site is controlled by SharePoint's external sharing policies.

• SharePoint is where the underlying files and folders for a Teams channel are stored.

• The guest expiration setting is configured at the SharePoint site level, which in this case is the site associated with the Project1 team.

• This feature allows you to set an expiration period (e.g., 90 days) for guests who have been invited to a specific site or who have been given access via a sharing link.

The other options are incorrect for the following reasons:

• Microsoft Teams admin center settings for Guest access and External access are for general, organization-wide permissions for guests and external users. They don't provide a per-site or time-based expiration policy.

• Microsoft 365 admin center is where you manage settings for Microsoft 365 Groups and user accounts, but the specific, granular expiration of access to a team's content is managed through the SharePoint site's sharing policies.

• Privileged access settings are for managing highly-privileged administrative roles and are not related to guest user access to a team's content.