Hi @itu ,
You may need to do more steps on the MC7455 pinout in the PTS and compare it with the pinout of your mini-PCIE slots. They are almost incompatible if you are using standard laptop slots. Your problem is similar the topic below. You can refer to it for more detail
MC7455 Not Detected - Ubuntu18.04 - Embedded wireless modules / MC/EM Series - Sierra Wireless Forum