Service Administrator Passwords
When your company’s technical contact receives their Microsoft Online Services credentials, they are given a service administrator account (for example, Admin@example1.microsoftonline.com), and a temporary password.
The first time your company’s technical contact signs in, they must change their temporary password. After changing their password, they are granted access to the Microsoft Online Services Administration Center.
The first action that the technical contact should perform, after getting access to the Administration Center, is to create a new user account with service administrator credentials. This new account can be assigned a mailbox and licenses for additional services.
Having more than one account with service administrator permissions provides a back-up in case you forget the password to one of the accounts. Any account with service administrator permissions can reset the password of any other Microsoft Online Services account for your company.
If you forget the passwords to your service administrator accounts, you can contact Microsoft Online Services Technical Support and ask for a password reset. The Support team will verify that you are trying to access the correct Administration Center, and then reset the password.