Don't worry!

This is normal because the lead booker is the only booker to receive the confirmation email with the booking summary and payment details. There are 2 reasons for this:
No emails are sent from Yoonly to co-travellers in order to keep the number of emails sent as low as possible and thus avoid most Yoonly emails ending up in the spam box.
It is more convenient that we have one contact person for the correct handling of the booking and can communicate in a targeted way in case of ambiguities or problems.