DHCP Server not assigning IP Adress to guest WLAN

Question

Hello, 
 we installed a Unifi Cloud Key gen 2 with 4 Access Points to provide WLAN. 
 In UTM: We created 2 new interfaces (see attached files). For these 2 we activated the DHCP Service of the UTM. 
 
 On the cloud key: We created 3 Networks:* The internal Network uses the DHCP Service from the Windows Server. The other 2 networks ("Gast" and "Kunden") we created a DHCP Server in the UTM. 
 For some reason we don't get any IP leases in the "Gast" and "Kunden" Network. The Network that is getting DHCP from the Windows Server has internet access. Only the ones where the Sophos UTM provides DHCP don't get an IP, but they get a connection to the network. (lease table is empty). 
 Does anyone have an Idea, what the problem could be?

PhilippRusch · Answer

Hello Jan, 
 how should the "Cloud Key" system know, that it has to pass the DHCP-requests of its clients to another system? 
 Normally this is done by configuring a DHCP-Relay or some kind of "external DHCP" service. There must be some kind of configuration on the "Cloud key" for this. 
 But we would need some more info of that system to answer this. A network iagram would be helpful as well.