Proxmox not seeing R720 PERC H710P Mini B0 (HBA/IT Mode)

Current Setup:

Server - Dell R720

Card - PERC H710P Mini B0 (Flashed to HBA/IT Mode using Fohdeesha)

Storage

    128GB SSD attached to server through Optical Disk to SATA adapter

    5x 8TB HDD attached to server through backplane (Front Drives)

    2x 600GB HDD attached to server through backplane (Front Drives)

OS - PROXMOX VE 8.1.3 (Installed on the 128GB SSD)

Issue:

PROXMOX doesnt see the Drives attached to the backplane