After you complete the sign-up process, you’ll get an introductory email at your alternate email address that includes your user ID and the URL of the page where you will sign in to Microsoft 365. This email address is used for important notifications, such as resetting your admin password, so you must be able to access the email account if you don’t have access to Microsoft 365. When you sign up for Microsoft 365, you also need to provide an alternate email address that’s not connected to Microsoft 365. Set up and use an alternate email address

The domain part of the user ID is either the domain that you chose when you signed up for Microsoft 365 or another domain-for example, your organization’s custom domain-that you’ve added to Microsoft 365.įor example, if you chose as a domain name when you created your account, and you’re creating a user account with the user name colin, the user ID would be you want to use your custom domain for user IDs and email addresses, see Add a domain to Microsoft 365. You’ll create a new user ID, with a unique user name, for each user account that you add to your subscription. The following information is for Microsoft 365 admins only.

For more information about changing your password, including how to create a strong password, see I forgot the username or password for the account I use with Office. Use it with your user ID every time you sign in to Microsoft 365. When you do so for the first time, you have to create your own password. A user ID may look similar to the following: your user ID is created, Microsoft 365 assigns you a temporary password that is sent to you so you can sign in to Microsoft 365. Your user ID is the unique email address that was created for you to use when you sign in to Microsoft 365. Office 365 operated by 21Vianet Office 365 operated by 21Vianet - Small Business Admin Office 365 operated by 21Vianet - Admin More.

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