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This usually means the Gmail address is still reserved on a Microsoft account, but it is not being accepted as a current sign-in username.
Try this in order:
- Check whether the Gmail address is recognized as a Microsoft account.
- Go to the Microsoft account sign-in page at
https://account.microsoft.comand enter the Gmail address. - If a password prompt appears, that Gmail address is a Microsoft account.
- If the message says
We couldn't find an account with that usernameorThat Microsoft account doesn't exist, verify the spelling and domain carefully.
- Go to the Microsoft account sign-in page at
- Run the Microsoft Sign-in Helper.
- Use the Sign-in Helper at
https://aka.ms/sign-in-helper. - Enter the Gmail address or mobile number tied to the account.
- If the tool detects a problem, it will tell what action to take next.
- Use the Sign-in Helper at
- If the account has been inactive for more than two years, it may have been deleted.
- In that case, the account cannot be reopened.
- If the Gmail address was only used as a verification method, not as the current sign-in alias, normal sign-in can fail.
- Microsoft states that Google credentials cannot be used to sign in to a Microsoft account.
- A Gmail address can be used to prove identity, and it can also be added as a way to sign in only through the Microsoft account alias management flow.
- If the account was previously changed or the sign-in alias no longer works, use the account recovery form.
- Complete the form from a device and location previously used with that account if possible.
- If two-step verification is enabled and none of the alternate verification methods are accessible, support cannot reset the account or change account details.
- If access is regained, add another alias or review sign-in aliases.
- Sign in to Manage how you sign in to Microsoft and add another email if needed.
- Then set the correct alias as primary.
Important:
- Do not create a new account with that Gmail address unless Microsoft confirms the old account is gone.
- Microsoft support agents cannot send password reset links or directly change account details for protected accounts.
References:
- How to check if your email address is a Microsoft account
- Microsoft account sign-in helper
- I can't sign in to my Microsoft account
- Help with the Microsoft account recovery form
- Link your Google account and Microsoft account
- How to add an email address to your Microsoft account
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