Button on MacBook Pro by Touch bar

That appears either to be a small magnet, or possibly a small shim used for the TouchID button. If the laptop was repaired, then it is possible a shim got lost and got stuck there. Just remove it as it may damage the glass or LCD panel when the laptop's Display is closed.

The Mav wrote:

Thank you! Here’s a pic:

https://discussions.apple.com/content/attachment/b00bb15b-c08b-4e9c-9823-e54a2c262395

Never seen it before...

Call Customer Support  (800) MY–APPLE (800–692–7753)

or on line  Apple Support

or call  AppleCare Support at 1-800-APLCARE (800-275-2273)

Outside the USA—Contact Apple for support and service by phone

See a list of Apple phone numbers around the world.

Contact Apple for support and service - Apple Support

The Mav wrote:

What is the little silver button by the 8 & 9 keys on the 2020 MacBook Pro with Touch Bar?

Shift Command 6 will screen shot the Touchbar—

maybe posting that image with circles and arrows or highlighting the "little silver button" in question...(?)

Customize the Touch Bar on Mac - Apple Support

Use the Touch Bar on Mac - Apple Support