Open Outlook on your Mac.
Navigate to the Tools menu (or the Outlook menu if it’s your first time) and select Accounts.
Alternative for first-time users: If Outlook is opening for the first time, you may see a “Welcome to Outlook” screen or a prompt to Add Email Account;

In the Accounts window, click the plus sign (+) in the lower-left corner and then select New Account (or Add an account).

A prompt will appear. Enter your full Microsoft 365 email address (e.g., yourname@yourbusiness.com).
Click Continue.

Outlook will attempt to find your account settings automatically.

When prompted, enter the password for your Microsoft 365 email account and click Sign In.

If your organization uses Multi-Factor Authentication (MFA), you will be prompted to complete the second verification step (e.g., entering a code from an authenticator app or approving a sign-in request).