Why is a New SSID Named "Zyxel-XXXX" appearing from the Access Points?

Zyxel_Jami

The SSID 'Zyxel-XXXX' may appear for the following reasons:

Factory Default Settings:

When an access point (AP) is reset to factory settings, it may broadcast a default SSID like 'Zyxel-XXXX'. 'XXXX' followed by the last four digits of the MAC address.

You can disable it or change it through the AP's management interface. Make sure that the AP is configured with your desired SSID settings to avoid unintended broadcasts.