Create a trusted application associated with the Poly Cloud Relay within a selected Trusted Application Pool on the Lync 2013 or Skype for Business server.
This can be done on the Skype for Business server with the Topology Builder or by using Microsoft PowerShell. The following Microsoft PowerShell example sets up a trusted application for a Poly Cloud Relay.
Note: This command example will generate a few error messages as the trusted application you are creating is not domain-joined. You can ignore both the Warning and Missing Computer messages.
Microsoft PowerShell commands to establish the trusted application
New-CsTrustedApplicationPool -Identity <ApplicationFQDN> -Registrar <FE or Pool FQDN> -site 1 -RequiresReplication $false -ThrottleAsServer $true -TreatAsAuthenticated $true
New-CsTrustedApplication -ApplicationID rc-hybrid -TrustedApplicationPoolFqdn <ApplicationFQDN> -Port 5061
Note: You need to create a certificate for this trusted application.