@Andreas_Koelner 

 

Try to configure the Access Control manually. EAP320 is an old version AP and it may not support Guest Network(although on controller you have this option it may not work for EAP320)

I have EAP120 old version and it does not support Guest Network, but under my test if I set up Access Control, it works the same as "guest network".

 

See the instruction Method 2

I have both. Once I have the "guest network" feature on at the WLAN in the controller, but also a access control list active for this WLAN: Rule Name: WLAN frei Rule Mode: Block Rule Members: Subnets: 192.168.250.0/24 Add New Exclude Subnets: 192.168.250.254/32 <-- my router Add New Apply But I can access all devices, with IP4 also.