A Microsoft file hosting and synchronization service.
Hello, thank you for reaching out to Microsoft Q&A.
Please take a screenshot of the prompt you are receiving and upload it here. This will help us better understand the issue.
Meanwhile, please let us know if you have already tried using your Microsoft account password there. If it didn’t work, may I know if you are signed in with a local account or a personal Microsoft account on the device?
Is it asking for a Windows security username and password?
Go to Start > Settings > Accounts > Sign-in options > Password and try changing your password there.
See if that helps.