Hi Jason,

Facing difficulty in accessing account may be due to various reasons it may be due to if you forget the password of your Yahoo account or username. For this, you can reset your account password and get back access to your account in a few simple steps.
In case you’re in no doubt that you’re typing the correct sign-in information, then you need to consider the following:

• While using or entering password always check the “Caps Lock” or “Num Lock” keys – In case your password contains numbers or upper-case letters, then you should keep an eye on this button and always make certain that these two keys on your keyboard so that they will not get accidentally been pressed.
• If your Browser has auto-fill settings adjusted then your browser usually remembers your password, but in case you just have changed the settings then you are using this browser auto-fill methods then it may also create this issue. To resolve this issue you need to enter your new password manually to override your browser settings.
• If you’re in no doubt that you’re typing the exact information, modify your password without delay using the Sign-in Helper because this can be one of the signs that someone else accessed your yahoo account and misused your password.

I hope this helps.

Regards,
Lokesh