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Even though Duplex Unit is installed in my HP Color LaserJet Pro MFP 4303fdw Printer, but it is not detected when the configuration is set to Auto Detection of Duplex Unit. With Auto Detection enabled, the printer does not print on both sides automatically. However if the configuration is set to Duplex Unit "Installed", only then the printer print on both sides of the page automatically.

This is a bug or defect. Please advise on how to enable automatic both side printing even with "Auto Detection" enabled for Duplex Unit, without having to configure Duplex Unit "Installed".

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