Background - XenApp 7.6 on Windows 2012. Lync Server 2010 with Skype for Business 2016 client.
Trying to run Skype for Business 2016 client against Lync Server 2010. Microsoft says this scenario is possible if the server is running February 2015 Cumulative Update (4.0.7577.710). The server has been patched. I can open the client and login, however I receive a generic error message, see attached, that will not go away. If I click OK, the error message keeps coming back. The client works other than this error message. I cannot find any info in the event log on the Citrix server, the Lync server or any useful info in the Lync client logs.
Anything else I could look at that might help me with this issue?