I bought a used zf7363 to go along with my 8 existing zf7363 devices (connected with zonedirector). The "new" one doesn't seem to have 2.4ghz. It's connected to my zonedirector fine...it accepts new clients...but only 5ghz clients. I can't seem to find any checkbox that shows that it's disabled. It has the same firmware as all my other units (18.104.22.168.267). Am I missing something obvious?
With reference to your post, if this AP is being managed by the ZD, you can view the AP's settings by looking under Configure > AP > Select the AP with the issue > Edit.
Here you have the 2.4 Radio setting and 5 G Radio setting, you have the option here to check if the WLAN broadcast is turned on or off.
Also you can look under Monitor > AP's > Click on the MAC of the problematic AP > Here on the AP page, you should have WLAN as one of the parameter and can check if the WLAN is deployed on the 2.4 G radio or not.
I also recommend that you open a support ticket and send the Support info file of the AP for us to check if there are any issues with the AP.