We could reproduce the behaviour that drives cannot be found via the "Control unit" tab when the fieldbus communication used is set to CoE.
EDIT: For your information the connection method "Control unit" is based on SERCOS IDs and so is not available when drives are in CoE communication mode.
EoE is working fine for all usecases so feel free to use the "IP address search" or use the "ctrlX AUTOMATION" tab in combination with the DriveConnectApp.
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