Agency professionals must contact Amazon to request access to their clients' Seller Central accounts.

False is the correct answer because agency professionals do not need to contact Amazon to request access to their clients' Seller Central accounts. Instead, sellers can grant agencies access through the "User Permissions" section within their own Seller Central account. By assigning specific roles and permissions, sellers can allow agency professionals to view, manage, or edit their Seller Central account based on the tasks they need to perform, such as managing listings, handling advertising campaigns, or monitoring account health. This process is controlled directly by the seller, ensuring that access is granted securely and according to the seller's preferences, without the need for Amazon's involvement.