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How to enable Lync On-Premise to Federate with Office365 Lync Online

I’ve just been doing some testing between our Lync On-Premise installation and Office365 Lync Online with Thomas Lee (who is all over Office365 information)

The information about implies that Lync Online, once you choose Open Federation on your web admin console, will federate with any On-Prem Lync installation that also has open federation. We found this not to be the case. Our system is Open federation and already federated to Microsoft (not that that appears relevant), but initially adding contacts didn’t give presence.

Initially no presence


The solution is that you need to add a new Hosting Provider for Lync Online.

By default there are 3 Providers


To add Lync Online either click the new hosting provider,


Or to be quicker launch the Lync Management shell and run the command:

New-CSHostingProvider –identity LyncOnline –ProxyFqdn –Enabled $True


Once you refresh the Lync Control Panel you should see your new hosting provider


Once the CMS has had a minute or two to sync, everything worked fine


Credit where credit is due, I found the solution here

So it seems On-Prem deployments will need to add this hosting provider to allow anyone using Office365 to federate.

About the author

Tom Arbuthnot

Tom Arbuthnot is Principal Solutions Architect at Unified Communications specialist Modality Systems. He is a Microsoft Certified Master and MVP, blogger, has a regular podcast with UCToday at and is a regular speaker at events including Microsoft TechEd and Ignite. He co-runs The Microsoft UC User Group London.


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Tom Talks Microsoft Teams and Skype for Business thoughts and news