@mjbutsch 

Assuming a simple network setup with no VLANs and only 1 subnet, the local network would be the subnet that your local devices are on.  An example would be 192.168.0.0/24.  Since I use the Omada Controller I am not sure what format the router interface wants that value to be.  It could be 192.168.0.1, or 192.168.0.0/24, or even 192.168.0.1 with a mask (eg. 255.255.255.0).  It is important to know that the LAN I am listing is an example.  You will need your LAN.

The IP Pool would be the IP range that OpenVPN will assign the remote hosts.  You should use something outside the range of your local LAN.  I used 10.1.150.0/24.  

Another important note is that I believe Omada doesn't use the standard notation for CIDR networks.  Normally for a 24 bit network the last octet of the IP Address should be .0, but Omada seems to require .1.  How that translates: if you are using something like '/24' then instead of 192.168.0.0/24, you would enter 192.168.0.1/24.  If it's a /25, then it could be 192.168.0.1/24 or 192.168.0.129/24.

If you want help finding your specific values, try posting a screen shot of the router page where you are entering this info, as well as what the IP and Subnet Mask is on your local network.

With all of the above being said, I moved away from OpenVPN on the Omada Routers as they were using outdated security protocols.  I started using Wireguard.  Tailscale is another great option that I use for my company (and is super simple to setup, and has a free tier if you are the only user - or maybe now it supports 3 users on the free tier).