help with microphone connection in TRRS audio jack
The jack you have shown is a TRS jack, not TRRS.

Terminals 10 and 11 are switch contacts.  With no plug inserted, terminal 3 is connected to terminal 11, and 2 is connected to 10.  When the plug is inserted, these connections are broken.

If this was used as a headphone jack, the amplifier outputs would be connected to 2 and 3, with internal speakers connected to 10 and 11 - when a plug is inserted, the internal speakers would be disconnected.