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I signed-in my Microsoft account. But still it's not changing. If i remove my account and sign in though a local account, it's remained same. when i use MS word or PowerPoint , this username shows everytime.
On Word or PowerPoint, go to file, options, general and use the name you want in the Personalize your copy of Microsoft Office.
Tick the box that says always use these values regardless of sign into Office.
See if this link can help you.