Automation emails for more than one invitee

Most of my meetings include two invitees (I am a mediator).   I have set up automation so “reminder” emails get sent to both invitees.  However, I can’t seem to send a personal “thank you” email that includes both names.  The person who scheduled the appointment can get a thank you in their name, but the other invitee also gets a copy of the email with the original invitee’s name, which is a bit odd.

I would love to send one email that includes both invitees names, or individual emails where I thank each invitee by name.

I am on a paid, “standard“ plan.

Thanks!