Hi,

I have a MacBook air M2 and I have purchased another logic board with Touch ID included.
This would have been an upgrade from 8GB/256GB to 24GB/1TB by swapping the board and button.

I swapped out both the board and the included button and Touch ID worked fine but True Tone was missing.
I then run apple diagnostic and it complained about the ambient light sensor.

I was unaware of this limitation so to see if light sensor still works I swapped back the OLD logic board but left the NEW Touch ID in the cassis.
After that I have run apple diagnostic again and the ambient sensor issue was gone now it complained about Touch ID.
Of course I expected this since the OLD board was running with the NEW button.

Then I reinstalled the OLD touch ID and accidentally installed the NEW logic board with it.
They just look the same. I mixed them up mistakenly.
I realised it but run an apple diagnostic regardless just to see what happens.

So of course as expected the Touch ID did not work nor the ambient sensor and True Tone.

To summarise what happened.

I run the NEW logic board with the OLD Touch ID and run apple diagnostic.
I run the OLD logic board with the NEW Touch ID and run apple diagnostic.

After this, neither of the logic boards accepted either of the Touch IDs.
They don't seem to be damaged at all in any way.

Since the Touch ID connect to the sub logic board, I thought may be I damaged the flex cable between the logic board and the sub logic board, or the sub logic board itself got a fault.
So I have then sourced another Macbook air M2 that WORKED FINE except the screen was broken.
Removed the logic board and Touch ID and put them away... far away.
Let's name them LAST logic board and LAST Touch ID.
That had a sub logic board and a flex cable verified working so I kept those in there.

Then installed the OLD logic board and OLD Touch ID.
Touch ID still does not work.

Then installed the NEW logic board and NEW Touch ID.
Touch ID still does not work.

Just in case I mixed up the buttons I then tried all other combination.
OLD board and believed OLD button.
OLD board and believed NEW button.
NEW board and believed OLD button.
NEW board and believed NEW button.

F**K! Then I drank a whiskey.. 

Reinstalled LAST logic board with LAST Touch ID and that one still works fine.

So it seems like by mixing up the logic board and Touch ID blocks the functionality even if you later reinstall the correct board with the correct button. Or may be running apple diagnostic caused this not just simply macOS.

Question time...

Did any one experienced anything like this before?

Is there a fix for the issue?

Do you have any ideas what to try?

I already tried DFU restore the OLD board with OLD button. Touch ID still does not work.

Any input would be much appreciated.