When sending a meeting invitation you cannot add someone as a CC or a BCC to the meeting invite. Use the following instructions that detail how to define optional attendees in the meeting invitation.
More information about using Microsoft Exchange and Outlook
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Adding an Attendee to a Meeting Request in Outlook & Exchange Online
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Finding and Booking a Meeting Room/Resource in Outlook and Exchange Online
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Managing Shared Email Accounts & Distribution Groups in Outlook
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Problem with Outlook ActiveSync Maximum Number of Devices Allowed
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Setting up BCIT Email and Connecting to Exchange Online on Your iOS Device