Is when connected to a Cisco switch, to be configured for Tagging VLANS. If you don’t, your Access Points are unaware of the VLAN to be asscociated. You need to configure the VLAN for tagging It's a sort of passthrough so it can recongnize the VLAN for the appropriate client.
Add the VLANS for your Environment.
Tag the VLANS on all ports.
This concludes the Tagging of the VLANS for the Zyxel PoE Switch in order to pass along the VLAN from the Cisco Switch to the Aruba.