How to manage permissions for a group from Exchange admin center?

Step 1: Sign into Office admin portal via https://portal.office.com/

Step 2: Click on Admin and navigate to Exchange admin center.

Step 3: In Exchange admin center, navigate to Recipients > Groups.

Step 4: On the group properties page that opens, click Group delegation and configure permissions.

Step 5: Click Save

Note: this is only for the classic exchange admin center.