How to allow Office 365 Skype federation?

To connect to your meeting rooms on Lync, you need to ensure that your IT team has federated your Office 365 Lync environment to your room domain. It is a simple process:

1. Log into your Office 365 admin account
2. Navigate to Service Settings
3. Select the section "IM, meetings and conferencing"
4. Set the "External Communication" switch to "On"
   
   
   
   
5. Save the settings and exit
6. Wait for a while (approximately 10mins)
7. Test by connecting to a room via Skype/Lync by typing the full address of the room "exampleroom@kokous24.fi" in the Skype/Lync search 
8. Click Call and enter the PIN using on screen keypad when Prompted
9. You should be in the room now