For what reason can’t access my Yahoo account if sign-in issue there?

Actually, it is basic that to access any account you have to sign in that with your client credential if you have an account there, and if not, then you have to create another account there. Thus, can't access my Yahoo account happens if you have a login issue. You need to likewise guarantee that you enter the correct email id and secret word. https://www.supporttechhelp.com/blog/cant-access-my-yahoo-account/