Event ID 14563
Source LS Protocol Stack
Two servers cannot be configured at the same FQDN with different server version numbers.
Cannot configure a server at FQDN [exchange.doamin.com] because another server is already configured there with a different server version number.
Cause: This is a configuration problem.
Review the server roles that are configured at this FQDN and ensure that they have identical version numbers.
Please review https://blogs.technet.microsoft.com/jenstr/2012/11/13/when-to-have-a-lync-trusted-application-pool-for-exchange-owa-im-integration/
It seems that you have trustedapplicationpool defined in Topology and also UM server is assigned for a dial plan. This will push twice server name to Skype.
Remove from topology or if you have several servers, do it in the way that it is popolated without a conflict.