I was also trying to send an email alert to the Person Account object using flow automation. I accomplished this by creating a flow on the Account object, adding my filters, then adding the email alert (which was based on the Contact object).
The steps to recreate this are:
- Create your email template. In my case, I pulled in the Account fields for personalization
- Create an email alert on the Contact Object (From Email Address Current User's email address and Recipients Email Field: Patient Email)
- Create a flow on the Account Object
- Add filters to the flow
- Drag the "Action" element to the canvas
- Search for your email alert (on the contact object)
- Label the action whatever you'd like
- for the "Set Input Values" field, enter {!$Record.PersonContactId}