Once this process is complete you will be able to install a new Authy app which will not show this error. To resolve the “Multi-device is disabled” issue, you need to reset your account directly with Authy. “Multi-device is disabled” error usually appears if you have already had an installation of the Authy app present and you no longer have access to the app (e.g. I have installed the Authy app but am getting the ‘multi-device is disabled’ error? Thus, to prevent this on the CoinFLEX platform, we do not support SMS for 2FA sign in. What makes this different from other attacks is that someone could have reasonably good security and it can still be circumvented.
From there, the hacker arranges to reset the victim’s email using the SMS recovery option on their email account by which point the hacker often has all the information they need to access the vast majority of the victim’s online accounts. In summary, the attack involves a hacker contacting a victim’s phone operator and convincing a call centre agent to transfer the victim’s phone number over to another, hacker controlled, SIM card. There has been an increase in the instances of people having their mobile phone numbers taken over by malicious attackers via social engineering of mobile phone operator staff. Why CoinFLEX does not support SMS for 2FA sign in? FIDO U2F Security Key is not a compatible key. If you are a YubiKey VIP user, please use slot 2 to generate a valid token. CoinFLEX supports 44-character YubiKey tokens. You can purchase a compatible YubiKey on Amazon. You can find out more about YubiKeys here and here.
A YubiKey is a small USB device that you register with your CoinFLEX account and use every time you sign in. You can find out more about these options on the Authy blog. Authy apps are instant, do not require continuous internet connection and the desktop app enables a seamless two-factor authentication experience. You can use the mobile app for Android or iPhone or a desktop app which runs as a Chrome extension.
Authy 2FA gives you multiple options for obtaining codes. If you prefer not to download and install the Authy app, you may use a YubiKey as your preferred method of two-factor authentication.
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