"devices" mean the f***ing STUPID "smart"phones, of course.

This is what I got for deleting all cookies in my (also STUPID) Vivaldi web browser:

Originally Posted by STUPID GitHub Bot
A sign in attempt requires further verification because we did not recognize your device. To complete the sign in, enter the verification code on the unrecognized device.

Device: Vivaldi on Windows
Verification code: 908269

If you did not attempt to sign in to your account, your password may be compromised.

Visit https://github.com/settings/admin to create a new, strong password for your GitHub account.

If you'd like to automatically verify devices in the future, consider enabling two-factor authentication on your account. Visit https://help.github.com/articles/configuring-two-factor-authentication learn about two-factor authentication.

If you decide to enable two-factor authentication, ensure you retain access to one or more account recovery methods. See https://help.github.com/articles/configuring-two-factor-authentication-recovery-methods in the GitHub Help.

The GitHub Team