Use of Touch ID button on 2020 MBAir lost.

"Use of Touch ID button on 2020 MBAir lost.: What might cause the failure of the Touch ID button on my 2020 MBAir?"

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How is it failing? Is your Mac not powering on? Or, is Touch ID not working?

Troubleshooting Touch ID:

Reset the SMC and your NVRAM:

(Applies to Intel-Based Macs Only): Sometimes when changes are made to the system(i.e. Updates), system configurations (i.e. for Power) become manipulated, technically. So, reset the SMC and NVRAM. Try performing each thrice. It may take sometime, being certain you have the time to perform these resets.

"Use of Touch ID button on 2020 MBAir lost.: What might cause the failure of the Touch ID button on my 2020 MBAir?"

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How is it failing? Is your Mac not powering on? Or, is Touch ID not working?

Troubleshooting Mac Power:

A. Black Mac Screen:

Go Here: If your Mac doesn't Turn On or Start Up - Apple Support

Using External Devices: Try Resetting the SMC and NVRAM, but this time, using an external keyboard. Connect an external monitor and see if you get an output.

B. Mac Power Issues:

Try a New Charger:

If it is currently charging from a charger, then use a new charger:

• Power & Cables - Mac Accessories - Apple - Select "Mac Compatibility" on the left
• Find the right power adapter and cable for your Mac notebook - Apple Support

C. A Few Links to Refer to Power:

• If your Mac doesn't Turn On - Apple Support

• How to Turn your Mac On or Off - Apple Support

• About Mac Notebook Batteries - Apple Support

• Charge the MacBook Pro Battery - Apple Support

• If your Mac Battery won't Charge - Apple Support

See this article.

If Touch ID isn't working on Mac - Apple Support