Is it a problem if I was testing and authenticated multiple times without deregistering?

[adiberk]

Terrific library - really clean, pretty awesome reverse engineering.
As said in the title - is there something I should do here? I only saw after that you are supposed to deregister if you aren't using it anymore. I authenticated without deregistering at least 10 times just to test some things

Also when I wasn't using 2fa I got an "enter cfv (cvf?)" line but never got any email or sms to enter. Which I thought was strange

[mkb79]

As said in the title - is there something I should do here? I only saw after that you are supposed to deregister if you aren't using it anymore. I authenticated without deregistering at least 10 times just to test some things

If you've missed to deregister the device, you can visit the Amazon website and go to your devices section. On German marketplace you can find it here. Here you can remove the unused devices.

Also when I wasn't using 2fa I got an "enter cfv (cvf?)" line but never got any email or sms to enter. Which I thought was strange

Yeah, there are an issue with deactivated 2FA. I'd to rework the process of prepare the html response from Amazon when 2FA is not active. But most users have 2FA activated, so I'd spent my time on other resources.