Final answer:
Configure conditional access policies to prompt for additional verification in a federated third-party application but not in Microsoft Outlook in Microsoft 365.
Step-by-step explanation:
In order to prompt users for additional verification when accessing a federated third-party application while not prompting for additional verification when accessing Microsoft Outlook in Microsoft 365, you can configure conditional access policies.
Under the conditional access policy settings, you can set specific conditions for the third-party application that require additional verification, such as multi-factor authentication. At the same time, you can exclude Microsoft Outlook from these conditions, ensuring that users can access it without additional verification.
By using conditional access policies, organizations can have granular control over the security requirements for different applications in Microsoft 365, ensuring that the appropriate level of verification is enforced.