A company deploys Office 365 in a federated identity model. The environment has two Active Directory Domain Services (AD DS) servers and two Web
Application Proxy servers that are not joined to the domain.
All externally published applications that use Windows Authentication and are hosted on-premises must use Active Directory Federation Services (AD FS) to log on.
You need deploy pre-authentication on the Web Application Proxy (WAP) servers.
What should you do first?
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