Modified from my answer at https://apple.stackexchange.com/questions/322301/xlr-microphone-not-working-with-phantom-power-supply
You still need a microphone preamp.
As always seems to happen with these mics, they are bought by people for whom it is their first venture into the audio field, beyond a headset mic.
Unfortunately, nothing in any of these ads tells you precisely what you are going to need - nor do they even supply the right cables in the box to be able to do it.
Theoretically, you can get a signal out of them by using a PC's built-in low voltage supply that can power headsets.
In practise, that really doesn't work well at all - so then people buy a phantom supply, without realising they still really need something to get the signal into the computer at good levels.
If you bought a separate phantom power supply & can return it, do so, you don't need it.
BTW, there is nothing inherently wrong with these phantom supplies, it's just they are more use to a sound crew with 48 inputs, but only have phantom on the first 24, for instance. Keeping a box of these on the truck is a cheap, efficient alternative to a more expensive desk.
Even on the picture for these supplies it shows you need to connect it to a preamp.
Preamps are readily-available with built-in phantom power & USB connection.
They become the instant bridge between your mic & your computer. They supply the correct phantom power to the mic & become a useable input for the computer.
Get anything like the following list obtained by Googling "USB Phantom" -
Random selection on Amazon
They run from approx £30 to many hundreds, depending on number of inputs/features etc.
All you need as a basic starter kit is 1 mic input with phantom power.
You also need a male-female XLR cable which will connect to the pre-amp's mic input, which those mics are not supplied with.