The printer is unreachable from the AP while it is in power-saving mode.
Zyxel Employee
When the printer enters power-saving mode, it may partially turn off or suspend its network interface, such as Wi-Fi, Ethernet, or the print service. During that time, the printer may not respond to ping, discovery, or print requests until it wakes up again.
You could enable the U-APSD function of SSID that printers connect to.
Navigate to Site-wide > Configure > Access points > SSID advanced settings > scroll down to Advanced settings
You could refer below link as your reference about U-APSD.
If the problem persists after enabled U-APSD, further investigation of the specific settings of the Zyxel access point and printer may be necessary.
Please feel free to contact us by creating a ticket or post a topic on our Zyxel community: https://community.zyxel.com/en
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