I am trying to aggregate my two internet connections with my Asus router. I already have the CPE 710 connected to the AP from a few hundred meters away and internet connection is already enabled and the primary WAN is already working.

However, I can't find anywhere the option to enable LACP on the CPE 710 as instructed in the Asus router guide

(See Snippet below of the guide)

This is the error I am receiving from Asus Router Side

How do I make CPE 710 work with WAN Aggregation or how would I enable LACP/802.3ad on the port 0 of the CPE?

My Asus Router btw is an Asus RT-AX86U which has a WAN Aggregation capability on its WAN and LAN 4 ports.