Hi, welcome and thank you for your question. My name is ***** ***** I am glad to assist you today.
I am very sorry about your issues. Is it only Microsoft Office 365 that is prompting you for a password? So are you saying that you can use your computer just fine, but when you try to open your Microsoft Office 365 programs, it is prompting for a password?
Please let me know by replying to me here so that I can help you further.