Use this method if you typically access your apps through the Office portal:
Sign in to your Office 365 account, using your existing password.
Select your profile on the upper-right side, and then select View account.
Select Security & privacy > Password.
Type your old password, create and confirm your new password, and then select Submit.
Please note, these errors can depend on your browser setup.
If this problem persists, please contact our support.
