Issues with logins can arise from a range of platforms as well as user-side issues. Suppose the user cannot check in to the email account. In that case, the service may be unavailable, or the login credentials may have been entered incorrectly. Try these methods to identify the cause of the user's in yahoo trouble signing in:

• Ensure Caps Lock is not activated. If it was on, switch it off and sign in once more.
• Ensure the password is accurate.
• Check Yahoo Mail's status. Wait until the status changes before checking back if Yahoo Mail is down.
• Change the password. If none of the passwords the user remembers work, start over.
• Clear the cache or the browser's cookies. Change the browser.
• Use the email-specific page to log in. Log in using the main Yahoo.com website if you cannot do so through the email-specific page.
• Restart the browser after quitting.

The user must follow the above methods, which can't sign into yahoo mail.