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Lync Federation stopped working for one 3rd Party

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My Office 365 Lync client won't 'connect' to a federatded partner of mine (


It used to-  and I can federate to it from another Lync account I have. (I can also federate between that 'other account' and Office 365 Lync which shows that federation is possible and working.


I want to know why this has changed and what I can do to resolve it. I tried the virtual assistant but it is 'very poor' at suggesting technet articles that may help. Ahem...


Is this an issue with Microsoft's Office 365, platform, the third party's ( or is it an issue with my settings and therefore something I can fix?


Any help/advice appreciated.



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Verified Answer
  • Hi Tj,

    Thank you for your reply and providing the detailed information.

    I understand that you have an Office 365 account and a Lync server account. These two accounts can be federated properly. However, the Office 365 account cannot be federated with a third party Lync server account.

    Before moving on, please contact the third party contact to make sure that your domain is shown in his/her Lync server’s federated domain list.

    If the issue persists, you can refer to the following KB article to troubleshoot this issue:

    Instant messages to federated Lync contacts fail

    @Victoria Waner, thank you for your information.

    Mindy Pan

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