A dynamic mic that needs phantom power ?
That seems odd - 'dynamic' means the microphone itself is a voltage source - just a coil in a magnet, basically - no input power needed.
This thing is intended for 'condenser' microphones that need 12-48 volts input to generate over 100 volts internally.
There is another class (electret) of microphone that needs only 3-6 volts, usually on a 3.5mm jack called plug-in-power. The voltage just powers a single FET (transistor) pre-amp. Most 3.5mm microphones and sockets have this power, even if it is never mentioned in the technical specifications. Computers do.