many people
Google Authenticator
I think you are using .
When a QR code is read with a QR reader, it consists of data in the following format.
otpauth://totp/Company:John/?issuer=Company&digits=8&secret=ONSWG4TFOQ
You can obtain the 6-digit code as long as you have the "secret" in the above data.
This tool is a simple tool to obtain a code using a secret as input data.
A tool that displays codes from TOTP secrets used by Google etc.