How to BCC guests to a Teams meeting?

Melaina_Neschke  Are you users creating the invitation from Teams?  Please ensure they are using outlook and not Teams for the calendar invite.  Only the meeting organizer should be able to see who responded and was invited.  What version of Outlook are your users using?  

Here are few other options:

1. Use the web version of Outlook to send the invitation out.  Under Response Options you can select Hide attendee list

2. In the desktop version you could try turning off Request Responses (I have not tested this so would love any feedback if anyone does).

3. Have them save the calendar invite as an ical, then attach it to a regular email or place it in a shared folder and create a link the email to add to the calendar.  HOWEVER, I encourage you to have them "cancel" the invitation prior to saving the invitation to ensure no-one could go into the scheduling assistant to see who responded.  

Now if the meeting organizer needs to know who has RSVP'd then depending on the number of invitations being sent out they could do a few things.  Send an email inviting them to the event and then: 

1. Use voting buttons in Outlook and then send the ical to those who respond yes

2. Use Forms and Power Automate to automatically send the invitation.  

Lot's of options.  I hope one of these helps you.