Double sided airprint Synology DS220j Oki B410

[andbb]

I have a Synology DS220j, configured as printer server for an Oki B410, which prints double sided.

Double sided printing works perfectly from Win11, but from iPhone 12 (iOS 16 and 17) via Airprint I cannot choose double sided printing.

I cannot find any Airprint setup in the Synology Control Panel.
Any help anyone, please?

 

[Fortran]

Airprint is direct between the iPhone and the printer; it doesnt go via the Synology. If you're not getting double sided options on the iPhone, then it's a limitation caused by airprint on the iOS device, not the Synology or the printer.