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Outlook | Windows | New Outlook for Windows | For home
Using New Outlook on Windows for personal email, calendar, and contact management
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Hello Hsiu,
First, double-check your email address for any extra spaces or mistakes, then try signing in at Microsoft Online Login to confirm your account is active. If that works, clear cached sign-in data by logging out and using an incognito browser window. If you suspect a password issue, use the “Can’t sign in” option to reset it. For Outlook desktop, you can repair your profile by going to File > Account Settings > Account Settings > Repair.
this might help