You'll need to say more. Describe your situation, what you're trying to accomplish, what the challenges are, and what you've tried so far, including the minimal code.
Bring up this topic on StackOverflow using the python-pptx tag. This issues list is only for suspected bugs. Support questions go over there.
Is there any way of using the font files(ttf, otf or woff2) for changing the font of the pptx in python pptx?