Microsoft 365 Not Recognizing Me

Question

I have been using Microsoft 365 for more than ten years. I cleaned the computer with cc cleaner yesterday, now I can't login to Microsoft 365. It says my email account is not recognized. I use it locally on a Windows 11 computer. Is there a current bug?

Answer 1

1

CCleaner may have deleted some files from the Office installation, the best first option is to to perform a full repair of your Office installation.

Open the Settings App (gear icon on your Start Menu)

Go to Apps, then scroll down to find Microsoft Office

Select that and choose Modify - Online Repair

That should fix any issues with your Office Installation.

2

If that does not resolve the problem, completely uninstall Office, then restart (not shut down) your PC and reinstall Office from your Microsoft account online.

https://account.microsoft.com/services/

Answer 2

There is no documented widespread bug in the provided information that causes Microsoft 365 to suddenly stop recognizing a long‑used account after running a cleaner. The symptoms match a local sign‑in/identity issue rather than an account being lost.

Use these checks and steps:

1. Confirm the correct account and subscription

• Sign in to Microsoft 365 on the web at www.microsoft365.com and select Sign In.
• If sign‑in fails with “We don't recognize this user ID or password,” verify:
  • The user ID is typed correctly and in the form someone@example.com.
  • The password is correct and has no extra spaces if pasted.
• If the account works on the web, go to Subscriptions and confirm that a Microsoft 365 Personal/Family subscription is still active and associated with that email. If the subscription is not listed, that email address will not work for activating Office on the PC.

2. If the account is “not recognized” only in the desktop apps If the same email and password work in a browser but not in the desktop apps, local identity data is likely damaged (which can happen after cleaning tools):

• Make sure the correct account type is used:
  • For a home subscription, use the personal Microsoft account, not a work or school account.
• If the error text is “We don't recognize this user ID or password” in the portal, follow:
  • Re‑enter the correct user ID and password.
  • If the user ID or password might be forgotten, use the password reset flow described in Forgot password to sign in to Microsoft 365, Intune, or Azure.

3. If the account truly is not recognized anywhere If the same email is rejected both in the desktop apps and on the web (portal and account pages) as an unknown account, then either:

• The email address being entered is not the one associated with the Microsoft 365 subscription, or
• The account credentials have been changed and need to be recovered using the standard “forgot password”/account recovery process.

There is no indication in the provided material of a current global bug matching this scenario; the documented causes are incorrect user ID/password, expired/incorrect subscription, or local authentication issues.

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References:

• Sign in to Microsoft 365
• "We don't recognize this user ID or password" error when a user tries to sign in to the Microsoft 365 portal
• Unlicensed Product and activation errors in Office