In mixer view (PF2), chechk input 1 or 2 as mic. Then check the level at input 1 or 2 in mixer view. If you see levels, then you get the sound in. Check if the sound output from UX2 is working, if needed raise the output level.

Also raise the send after checking it sends your input 1 or 2 (mic) to whatever UX2 is connected to.

If used in standalone mode, you have to first open PF2 soft. Launch it in your PC and test!

If used as plugin in a DAW, check in your DAW if the associated track is getting those outputs (1 or 2 channels depending on how you send the signal from UX2). If not you have to configure the track's I/O. You don't have 50 possibilities, just a few, so check them out all and try.

Also in the DAW, you have to first arm the corresponding track on which you receive the mic signal, for recording and set the monitoring on that is you want to "hear" what you play.

And check if your mic is working without UX2 if you can.

hope this helps