You should never set a <xref:System.Printing.PrintTicket> property to Unknown. If some other <xref:System.Printing.PrintTicket> producing application has created a PrintTicket document that sets the device font substitution feature to an unrecognized option (that is, an option that is not defined in the [Print Schema](https://go.microsoft.com/fwlink/?LinkId=186397)), then a <xref:System.Printing.PrintTicket> object in your application that is constructed with that document will have Unknown as the value of the <xref:System.Printing.PrintTicket.DeviceFontSubstitution%2A> property.
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