No audio input from the interface

The best way to solve that kind of issue requires step by step troubleshooting that follows the signal path.
Following that path the steps should be:

  1. Make sure that the interface is turned on (power LED is lit up)

  2. Check if the Microphone is connected with an XLR cable to microphone input of the audio interface.

  3. Check if the input selector is in the correct position according to the audio interface guide.