<> Could Not Be Found And This Message Was Not Delivered – Lync

When trying to message another Lync user, you can get this error:

<<Email Address>> Could not be found and this message was not delivered

This can be caused by a number of reasons:

  • You have typed the user’s details in incorrectly (maybe it was cached and was deleted / updated?)
  • You are sending a Lync message to someone on another domain, that is not fedorated or there is an issue with the domain trust (their domain doesn’t trust yours)
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