The extension is working just fine. For those who don't understand how to use it
It's sad for you but understand that your brain can't detect a simple interface but also can't ask nicely help, instead give one star for a free extension. So: 1. Click on the pen on the right (Rigtht it's the other Left). 2. Click on (+) to add. The red (-) sign on the already codes delete them. It's like the road sign of "Do not enter". Wait, you don't have driver licence. The check mark sign end the current operation (end mean that is over, it ends). It takes you to the main screen.
Sarcasm mode off.

Sometime, I just want to leave this planet :)
On my side, I appreciate if adding Language selection in preferences.
Thanks, for this, working with Google Authenticator and Microsoft One (08-2024).