How to map fn+F8 to F20 key so that mic muting works (hp envy x360)?

So my laptop has F keys, and keys that are on Fs but also have specials tasks, just like on any other laptop. They change the brightness, volume etc. BUT when I JUST press an F key on my laptop its going to use its abnormal function like changing the brightness. I HAVE TO press the fn button to in a way disable the fn behaviour itself so that for example when Im trying to change a name of a file. I have to press fn+F2 on my keyboard for it to act like a normal F2 key, if I were to simply push the F2 labeled button, it would change my screens brightness. Does that make sense?

Here is me pressing simply F8 labeled button, which should trigger mic muting:

 event15  KEYBOARD_KEY     +1.711s	KEY_UNKNOWN (240) pressed
 event15  KEYBOARD_KEY     +1.711s	KEY_UNKNOWN (240) released
 event15  KEYBOARD_KEY     +2.118s	KEY_UNKNOWN (240) pressed
 event15  KEYBOARD_KEY     +2.118s	KEY_UNKNOWN (240) released
 event15  KEYBOARD_KEY     +2.398s	KEY_UNKNOWN (240) pressed
 event15  KEYBOARD_KEY     +2.398s	KEY_UNKNOWN (240) released
 event15  KEYBOARD_KEY     +2.625s	KEY_UNKNOWN (240) pressed
 event15  KEYBOARD_KEY     +2.625s	KEY_UNKNOWN (240) released
 event15  KEYBOARD_KEY     +2.851s	KEY_UNKNOWN (240) pressed
 event15  KEYBOARD_KEY     +2.851s	KEY_UNKNOWN (240) released
 event15  KEYBOARD_KEY     +3.078s	KEY_UNKNOWN (240) pressed
 event15  KEYBOARD_KEY     +3.078s	KEY_UNKNOWN (240) released
 event15  KEYBOARD_KEY     +3.305s	KEY_UNKNOWN (240) pressed
 event15  KEYBOARD_KEY     +3.305s	KEY_UNKNOWN (240) released
-event3   KEYBOARD_KEY     +4.524s	KEY_LEFTCTRL (29) pressed
 event3   KEYBOARD_KEY     +5.465s	KEY_C (46) pressed
^C

This is when I do fn+F8 which would make it function as a normal F8 button on a normal keyboard:

^[[19~ event3   KEYBOARD_KEY     +8.482s	KEY_F8 (66) released
 event3   KEYBOARD_KEY     +8.498s	KEY_F8 (66) pressed
^[[19~ event3   KEYBOARD_KEY     +8.688s	KEY_F8 (66) released
 event3   KEYBOARD_KEY     +8.715s	KEY_F8 (66) pressed
^[[19~ event3   KEYBOARD_KEY     +8.809s	KEY_F8 (66) released
 event3   KEYBOARD_KEY     +8.830s	KEY_F8 (66) pressed
^[[19~ event3   KEYBOARD_KEY     +8.913s	KEY_F8 (66) released
 event3   KEYBOARD_KEY     +8.923s	KEY_F8 (66) pressed
^[[19~ event3   KEYBOARD_KEY     +9.006s	KEY_F8 (66) released
 event3   KEYBOARD_KEY     +9.021s	KEY_F8 (66) pressed
^[[19~ event3   KEYBOARD_KEY     +9.104s	KEY_F8 (66) released
 event3   KEYBOARD_KEY     +9.733s	KEY_LEFTCTRL (29) pressed
 event3   KEYBOARD_KEY     +10.137s	KEY_C (46) pressed
^C

Is that clear now?