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Unfortunately, this limitation made its way into the CCM for other products like the E-IPA card, Iris Panel and IP Transceivers (both 1.9 and 5). Because the CCM will not allow you to use those subnets, you must either use DHCP or follow these directions to work around the CCM limitation.
Add the Transceiver to the same network as the E-IPA card and your PC
In EHX, go to Transceivers and click Auto Detect
After some time (once the TCVR either gets a DHCP address or a link-local address of 169.254.x.x) you will see the transceiver pop up on the screen. Add it to to the project.
Once the TCVR is online, click the gear
From there, you can edit the Admin and AES67 IP addresses. Make your changes, save and apply map to the frame
To save you time, it is highly recommended that you stay away from the 172.23.x.x subnet AND use DHCP.