When a name of a cluster contains unsupported characters, the following error can occur in the Enterprise Manager log (server.txt file):
INFO IMon Error:
System.ArgumentException: An item with the same key has already been added.
at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
at Veeam.LicenseServer.InfrastructureMonitor.createDictionary(ClusterInfo[] state)
at Veeam.LicenseServer.InfrastructureMonitor.queryChanges()
at Veeam.LicenseServer.InfrastructureMonitor.go(Object data)
As a result, the cluster will not appear in nworks Enterprise Manager Web UI.