Hi @UpstateCabling
I'll look into this behavior - it sounds like there is validation logic preventing something you are completely allowed to do when creating a new wired network.
The warning you are seeing is simply a warning, but it means the IP address received automatically was done on a different VLAN than has been configured.
Given the wording of the error, it sounds like "VLAN 1" was set on the GX20 for the uplink, but no VLAN 1 is set upstream (or maybe it is untagged) and the GX is actually not using VLAN 1. As a result, it lets you know it went with VLAN 0 (none) as opposed to the configured VLAN 1.
Can you set the VLAN on the IP of the GX to 0 or nothing and see if the error goes away? It may take up to 10~15 minutes in a worst case scenario. The "Learn more" link should provide a link to documentation to learn more as well.