Hi,
I'm having similar issues with an Elitedesk 800 G1 SFF. I have set the "Remote Wake up Boot source" to "Remote Server" in the BIOS. In Device Manager I've set the Wake On LAN packet to "Enabled" and the " Allow this device to wake the computer" and in the Power Management have ticked "Allow this device to wake this computer", but still it steadfastly refuses to WOL!!
Have I missed something? I've got to say, I've worked with Dells for years and I've never had to go through so many hoops to try and get something that is so standard to work. WOL is a standard requirement these days, so it should be an absolute doddle to set up and work!!