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This Message was not delivered to '' because the address is outside of your organization and is not federated with your company, or the address is incorrect.

Issue: Lync Federation Broken.

Error: This Message was not delivered to '' because the address is outside of your organization and is not federated with your company, or the address is incorrect. Please contact your support team with this information. 
Problem Statement:
Recently one of my Lync federation partner complaint about Lync federation broken. Found that both Lync On-Premise organization has Lync domain and Access Edge FQDN properly setup and allowed on both organization.
Lync federated Partner recently renewed their external certificate with existing SAN names. And they have updated their certificate on Edge server.
Even able to test Lync, Test-CsFederationPartner. However Lync Federation not working. 
Checked everything however not found anything.
I have found resolution finally however this is quite come resolution.
1.     Renewed Certificate updated on Edge Server checked and confirmed.
2.     Open Lync Control Panel ; Click ‘External User Access’ ; under ‘Federated Domain’ ; Select the affected domain ; click on ‘Edit’ and say ; ‘Delete’.

3.     It will ask you to permanently delete, say ‘OK’.

4. Wait for 10 min. and then add the federated domain name and Access Edge server name under 'External User Access’ -> Federated domain.

5.     Wait for an hour and test the Lync IM or call to federated Partner.

Thank you.


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