Sending, receiving, and organizing email in Outlook.com
Hello,
What is the exact error message you receive when you sign in with your Microsoft account on Outlook online?
Open a private browsing window in any web browser.
Go to https://outlook.live.com/
Sign in with your Microsoft account and password.
If your password isn't accepted, see if you get the 'other ways to sign in' option on the screen.
Use your recovery email or authenticator app to verify your identity and sign in.
This will confirm whether the problem is with the password or with your Microsoft account itself.
If your password isn't accepted, try resetting your Microsoft account password.
Clear your browsing history, cache and cookies.
Then, sign in with Outlook.com online using your updated password.