The correct answer is Mail settings page.

You configure mailbox forwarding from the Mail settings page in the Microsoft 365 admin portal. Administrators select the user in Active users and then open the mail settings to enable forwarding or to add a forwarding address because mailbox delivery and forwarding options are managed there.

Licenses and Apps page is used to assign product licenses and manage application access and it does not contain mailbox forwarding options.

Devices page focuses on device management and mobile device policies and it does not provide controls for forwarding a user's email.

Account page shows account profile and sign in settings for a user and it does not include mailbox delivery or forwarding configuration.

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