PMSessionValidatePrintSettings never change on macOS

Hello,

PMSessionValidatePrintSettings return always "false" on macOS

PMPrintSettings settings;
PMPrintSession session;
Boolean result;

PMCreateSession(&session);
PMSessionSetCurrentPMPrinter(session, printer);
PMCreatePrintSettings(&settings);
PMSessionDefaultPrintSettings(session, settings);
PMSetDuplex(settings, kPMDuplexTumble);
PMSessionValidatePrintSettings(session, settings, &result);

PMRelease(session);
PMRelease(settings);
	
if (result) NSLog (@"%@", @"changed");
	else NSLog (@"%@", @"not changed");

Thanks