So, I tried to setup the following equipment at one site and ran into a major issue.

Lease Line from ISP -> Sophos XG 210 Firewall -> Unmanaged Switch -> OC200 & EAP 620 HD

Well, the issue is the OC200 is not grabbing an IP address from the Firewall. I've made sure that the port has DHCP Server enabled and checked whether it is working or not. 

It is just not working. I tried scanning via the Omada app to see whether OC200 is available or not. But, it is not. As a result, it can't connect to the internet and can't be configured.

Just to check whether it is not a faulty unit, I plugged the OC200 and EAP 620 in a broadband modem and a TP-Link basic router (in a separate instance), and it worked within seconds without any hiccups.

Then again i tried connecting to the Firewall and the OC200 is just offline. I've also reset the device and it is still not working.

Would appreciate any suggestions.

PS: The Firewall has some basic rules in place like a blocking P2P connections, tools etc. for obvious reasons.