Reset the password of your Microsoft account
If you forgot the password for the Microsoft account that you associated with Office, you can reset it at https://passwordreset.microsoftonline.com/.
Follow the prompts to reset your password.
Check that you typed your account name correctly
Double-check that you spelled your account name correctly. Check for typos and make sure characters aren’t swapped around. Try a couple of different variations.
You may be signing in with the wrong account such as a work or school account name, or an account that isn't a Microsoft account
You need to use the Microsoft account you associated with Office. If you tried to sign in using an account that was supplied by your work or school, you may not have a Microsoft account or you just entered the wrong account.
For help with work or school accounts, click the Office for business tab at the top of this article for solutions.
If you're currently signed in with a work or school account, but you're actually trying to sign in to manage your personal version of Office at My Account, you first need to sign out of your work or school account and then sign in with the correct Microsoft account.
Your account is correct, but it's not working
For additional help with Microsoft account sign-in issues such as blocked accounts, two-step verification, security codes, or issues with your account while travelling, see When you can't sign in to your Microsoft account.