appointments+ not recognizing me as logged in

Hi there,

When using app_my_appointments, the appointments I've booked will only show up when I've manually assigned a username/handle to an appointment that's been booked which I can see on the Admin page for Appointments+.

We have it set so that Appointments+ doesn't require login, but when we do set it so that it does, it doesn't seem to recognize that I'm logged in (even though I'm logged in as a Keymaster on WPengine).

So, a question: Only people who are logged in will ever see our Appointments+ booking page. How do we set this so that Appointments+ automatically recognizes that we're already logged in and automatically sets confirmed appointments to have the appointment be associated with the username/handle of someone trying to book an appointment?