A Microsoft file hosting and synchronization service.
Hello, thank you for reaching out.
Open an incognito tab in any web browser and sign in with your Microsoft account using the website link here-
If you get any error during the sign-in, please share the details of the error message here. This will help me determine what exact problem you are having with the sign-in process.
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Alternatively, if you believe your Personal Microsoft account may have been compromised, you can use the link below to reset your password first-
https://account.live.com/ResetPassword.aspx
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Regarding the error with Office applications, could you please let me know which part of Office applications isn't working correctly?