Problem setting up Orbi RBK50 from Virgin media hub 3 (Modem mode)

Am having problems setting Orbi from a Virgin Hub 3 as modem, is this the problem because the orbi router is in AP mode because i was using it as  AP from the prevoius set up. Do i need to switch it back router mode? I thinking this probably causing the orbi not connecting to Virgin Hub 3.

Kind Regards,

Wai