Calendar delegation in Outlook on the web
https://support.microsoft.com/en-us/office/calendar-delegation-in-outlook-on-the-web-532e6410-ee80-42b5-9b1b-a09345ccef1b
You can't give editor or delegate access to people outside your organization. At the top of the page, select the app launcher , and select Calendar. On the navigation bar, select Share > Calendar. In the Share this calendar dialog, type the name or email address of the person with whom you want to share your calendar.
DA: 31 PA: 98 MOZ Rank: 33