Help connecting to a printer located in the WAN Interface. Asus RT-AC1200

Hi ! I needed to separate my network from everyone else in an office location for compliance purposes. My Wan Port on my Asus router is connected to the internal network of this office. My WAN therefore is not connected to the internet directly. The office allows me to use a Ricoh/Lanier MP C6004ex Printer. This means the printer is on the Wan interface of my router. I have been trying to enable communication from a computer in the internal side of my router to the printer on the...

Help connecting to a printer located in the WAN Interface. Asus RT-AC1200