Some integrations or third-party apps work flawlessly with two-step verification enabled. Others may require to connect without two-step verification. If you have problems logging into some app with your Gender-API.com credentials, log into your account on Gender-API directly and click on "Settings" => "Change Password / 2FA" in the account menu. Then click on the "Two-Step Verification" tab and set "Third-party app access" to "Not restricted". Please note, you can only change this setting if two-step verification is enabled.