@Pastor Andres said:
Hi Sean,
In order to mark people as active you can access the “People” menu and on the People page select any checkbox that applies to that person (Do not search for the person). In the resultant list at the bottom of the page you will note the 3rd column – “Active”. Clicking on the black circle with an “i” in it will toggle the state of the person between active and inactive.
I cannot speak to how this individual may have become inactive inadvertently.