The following principals are not known

hello
I am deploying lync 2013 in my environment
when trying to add a user to the chat group I get the following message
"the following principals are not known"
any help
thanks

Hi,there
If you can add some other users to the chat group but only this user,you can check if this user is in a different OU rather than built-in Users OU in AD, I have seen an old
thread report the same error when add a user that is in custom OU fails,if so please check if this OU have RTCUniversalServerReadOnly permissions.
Regards,
Sharon
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