Discover Services fails with error An item with the same key has already been added (4378261)

When running Discover Services against a Windows asset, the following error appears:

[Timestamp] [TaskID] [Warning] (PID:2480 rSMS.WebService TID:67) {Hercules.Modules.Windows.WinRM.WindowsRmModule} DiscoverServices failed. ArgumentException (ArgumentException) An item with the same key has already been added. Key: GUEST. 

Guest user exists locally and in Active Directory with same username

STATUS:

Change Request # 473041 will address this issue in a future release of SPP