Morten, we have to be sure we're talking about the same thing.
"Plug-in power" is 5 volts supplied through 3.5mm TRS connectors to video microphones designed to ride on a DSLR.
"Phantom power" is 24 or 48 volts supplied through XLR (or 1/4 TRS) connectors designed for more professional condenser microphones.
Arjan, you're right the Dr44-wl has only XLR (1/4TRS) connectors and therefore has only phantom power capability. I didn't realize until checking that the 44-wl does not have a 3.5mm TRS input.
It has a hard 3-position switch on the right side to switch from LINE to MIC to MIC+PHANTOM. When set to MIC+PHANTOM and a microphone is connected, a pop-up "Phantom On-Are You Sure?" appears.
So, Morten, is everything properly engaged? Do you have the switch set to MIC+PHANTOM and does the pop-up appear?