Create an event registration platform

[emoryhatchery]

First: Is what I am attempting to do possible without custom implementation?

Action attempted: To automate sending out calendar invitations to an event after a participant registers using an Airtable form. 

Issue: When I try to build the automation, I get stuck on the portion that asks me to select the Outlook Event ID. I assume this refers to the actual event on the Outlook Calendar, but when I try to scroll through the options, nothing shows up but existing Airtable fields. Screenshot attached. 

Am I missing something here?

Thanks for any help in advance.