It’s unlikely but if the E2500 isn’t configured to provide more than one address, that would cause this behavior. A clue would be to plug in the mixer only to see if it gets an address.
Well I tried unplugging my DBX and using its cable then connecting my QU 24 with the cable I no works then powering up the board. It sees nothing. I believe it should allocate an ip address but nothing.
When you say the Qu-24 sees nothing I assume you are looking at the Setup / Utility screen? This is where the mixer would display the received DHCP address. If nothing is displayed then check the router DHCP settings as others have suggested.