Reset a user's password
If a user loses a password, you can reset it. To reset a user’s password, you must be a Microsoft Online Services environment global administrator, user management administrator, or password administrator.
For step-by-step instructions, see Reset a User’s Password.
The reset password is temporary. The user must change the temporary password at the next sign in. To help users meet the requirements for creating a new password in the Microsoft Online Services environment, see Set a user's password expiration policy.