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It's quite possible that the cookie that holds your login details - specifically the "trust this device" details is corrupt or just completely deleted. And you need to recertify your device for the two factor authentication purposes.

Can the cookie be replaced?

Just sign in and follow through with the two factor verification. Unless you have some sort of anticookie browser extension preventing that or possibly an overzealous ad blocker...? I suspect it should be fine.

Just a question for you. How did I get to able2know. I was trying to find a community form for Yahoo.

I have no idea what search engine result/link you clicked on. I'd assuming you typed your question into the damn Yahoo search engine bar and able2know was one of the top results. Why? Heck if I know. I don't understand SEO and search engine results. Nevertheless, you went ahead and clicked on the search engine result and ... one can assume ... created a new account.

We ain't affiliated with Yahoo or any tech support. Only you know your own browser history.