You are a Teams administrator. After running the PowerShell script shown in the exhibit, users report they cannot communicate with federated users from 'trusted.com'. What is the most likely cause?
The New-CsOnlineSession and Import-PSSession sequence is correct, but if the module is not properly loaded or the session is not created with the right endpoint, the cmdlets may not be available, causing the script to have no effect.
Why this answer
Option D is correct because the `Set-CsTenantFederationConfiguration` cmdlet is only available in a remote Teams PowerShell session (connected via `Connect-MicrosoftTeams`), not in a local Skype for Business Online or legacy PowerShell module. If the script was run in an incompatible session (e.g., an older Skype for Business Online Connector or a local PowerShell window without proper module import), the cmdlet would not execute, leaving the federation configuration unchanged. This would cause the default settings to block federated communication with 'trusted.com'.
Exam trap
The trap here is that candidates focus on the federation settings (AllowedDomains, AllowFederatedUsers) and overlook the critical prerequisite of running the cmdlet in the correct PowerShell session, assuming any PowerShell window can execute Teams cmdlets.
How to eliminate wrong answers
Option A is wrong because the `AllowedDomains` list is used to restrict which federated domains are allowed when `AllowFederatedUsers` is `$true`; a missing wildcard does not block all communication—it only limits allowed domains, but the script's primary issue is that the cmdlet itself did not run. Option B is wrong because `AllowPublicUsers` controls Skype for Business public IM connectivity (e.g., with Skype consumer), not federated users from another organization's Teams/Skype for Business domain. Option C is wrong because setting `AllowFederatedUsers` to `$true` enables federated communication, not disables it; the problem is that the cmdlet never executed.