Only one drive of my book duo recognized in router (TP-Link Archer C7)


I’m Ja Wesjej and I’m new on this community because I bought myself a My Book Duo (2x 3tb).

I’ve connected the “My Book Duo” to my network. The drives are set up with JBOD.
But my router does only recognize one of the two drives of the My Book.

How can I get my router to recognize both of the drives? My Book is connected with the usb3 entrance on the back of the router.

Many thanks for the replies.

The My Book Duo is designed to work in a computer environment rather than through a network.
The My Book Live Duo is already setup to work as a NAS.