As you may know, some time ago Microsoft has announced a new Skype for Business service to host large meeting called Skype for Meeting Broadcast.
This has been in preview since July 2015.
Now, as the service is scheduled for production very soon, preview customers need to update their configuration to use Azure CND – Microsoft Azure’s Content Delivery Network.
To do so, you must have installed Skype for Business module (available http://www.microsoft.com/en-us/download/details.aspx?id=39366)
Then execute the following commands to connect to your tenant
$Credential = get-credential
$LyncSession = New-CsOnlineSession -Credential $credential
NOTE if you are running Skype for Business Online in hybrid configuration with your On Premises, the session may failed to establish. Please amend the command the user –OverrideAdminDomain <your Office 365 tenant>
Then check the configuration of your tenant with the command
If the EnableBroadcastMeeting parameter is set to False, run the following command to re enable it
Set-CsBroadcastMeetingConfiguration –EnableBroadcastMeeting $True