How to BCC guests to a Teams meeting?

If you want to send a proper calendar invite and hide attendee emails rather than just sending an email then you will need to create separate calendar invites for each attendee. These calendar invites will be identical other than the recipient email being changed each time. This will will allow you to send calendar invites that are BCC and this can be done within the Outlook client. The resource line is not an option since it no longer supports emails and would reveal emails when clicking reply all anyway. Sending a calendar invite is preferred since that will be added to the recipient's calendar increasing meeting attendance. To automate this you could use the graph API to bulk create calendar invites or use Salepager which lets you send BCC Outlook invites with the meeting link.