BM-Manual page 19 Getting Started
The ATEM switcher chassis allways needs a fixed IP address so control panels have a stable location to connect to. This means you need to find a free fixed IP address in the range of your network that you can use.
ATEM mixer don't support DHCP ! So it will not send any requst to a DHCP server ("Standard Gateway" don't mean DHCP-server !). It makes no sense, to reserve a IP at DHCP-server based on ATEMs MAC.
Only the control panels (and computers with control software) can be set to DHCP.