I have another Yahoo account that you have blocked access to. Yesterday, I was still able to log-in to that other account, but as of today, after using the correct password, it says "Try a device you’ve signed in with before". Well, I am using the same device always. This is the only laptop computer that I am using in the last 15 years! However, I do reinstall the windows operating system about once a week. It may look like a new device, but it is the exact same one. Moreover, I am able to log-in to this current Yahoo account, and therefore it is strange that I cannot login to my other Yahoo account that is blocked (both accounts are linked for recovery). I understand that you are trying to "protect" my other account from hackers, but instead, you are causing harm to me. I could open a replacement new Yahoo account instead, but then I will have to ask everybody to update my contact info. I wish you had a better way to fight the criminals without hurting me, your customer. BTW, by forcing me to abandon my other Yahoo account that is blocked, you incentivise customers like myself to switch and create the replacement new account with either Google or Microsoft.