To establish interoperability between the on-premise deployment and Lync Online, the on-premise Edge pool must be configured for federation with the Lync Online tenant. The following steps are used to configure federation between an on-premise Edge pool and a Lync Online tenant:
1. Log on to a system where the Lync Server management tools are installed, and open the Lync Server Management Shell.
2. Execute the following command to enable federation and set basic parameters:
Set-CSAccessEdgeConfiguration -AllowOutsideUsers 1 -AllowFederatedUsers 1 -UseDnsSrvRouting
3. Execute the following command to establish federation with Lync Online:
New-CSHostingProvider -Identity LyncOnline ...