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All settings has been provided to this thread as mentioned above by one of our Moderator @Erika
"Other forums that ASUS currently has an issue in that when you use a LAN port for your WAN port it does not allow you to specify VLAN 2 as it seems to be reserved for the external facing ports on the device. It can probably be fixed with firmware."
Let us know should you require further assistance.
I used a dsl ac 52 on hfc.
if you are on the right setup page vlan id is 2, priority is 0, and there is a setting 802.1q which you have to enable, tick in the box, it will not work without a tick in 802.1q