Missing Touch ID Icon

Using the same Cable to Computer method and then try the below steps >>

1 - Restart in Safe Mode. This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts. The boot up will be slow and can take some time - Normal.

2 - Does the issue present in this mode ?

3 - Sometimes a Safe Boot followed by a Normal Boot will just put things right.

4 - If not - there could be something in the main User Account playing up. To further isolate this - Set up users, guests, and groups on Mac. Then log out of the Main User account and log into the dummy account and test again if the issue persists.

5 - If the issue is present in the dummy account - then, this appears to be a System Wide issue on the computer.

You may need to reset your System Management Controller (SMC).

Before resetting SMC:

1. Turn off your Mac.
2. Hold down the Touch ID button for 10 seconds, then release it.
3. Wait a few seconds, then turn on Mac.

If that doesn't solve the Touch ID problem, do these:

1. Shut down your Mac.
2. Hold the left Control + left Option + right Shift keys on your keyboard for 7 seconds.
3. Keep holding these keys while pressing and holding the Touch ID button for 7 more seconds.
4. Release all buttons and wait a few seconds.
5. Turn on your Mac.

Hope this helps!

This is the Touch ID Apple Keyboard on the Apple 24" M1 iMac ?

Is so, what happens when the Keyboard is connect via the Apple Supplied Cable?

Does the Touch ID Applet in System Preferences reappear ?