Attempts to delete a Legal Review Matter are unsuccessful

It has preference to have the Service Uniform Resource Identifier to match the Service Principal Names. Validate your DNS resolution to verify that the server name that is used is correct and present in order to resolve this problem. As an alternative you can modify the ZyLAB.EDiscovery.ExchangeDeletion.dll.xml configuration:

The file is located on .\Program Files (x86)\ZyLAB\EDiscovery\LegalReview\Review_web\Bin\DeletionWorkers\ZyLAB.EDiscovery.ExchangeDeletion.dll.xml

Add a valid ip adress of the system that runs the ExchangeSynchronizationService in the ReviewExchangeServiceUri line:
Example:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <appSettings>
    <add key="ReviewExchangeServiceUri" value="net.tcp://IPADRESS:4120/ExchangeStandalone/ExchangeSynchronizationService" />
  </appSettings>
</configuration>