Date TextField showing Red in Available Options of a Backend Call to Supabase

I have to be missing something here. For the life of me, I can't understand why is the TextField (dateOfBirth) I have in my form showing Red (unselectable) when I'm in the Set Fields of my Backend Call? What is available is the "Date Picked" of my Date Picker widget. That's totally useless to me as any time I do an update to one or more of the form fields, the Date Picked is empty, and when the database update occurs, it overwrites the value stored in the Supabase table dateofbirth field with a null. The only time Date Picked is okay, is when someone has selected a date prior to the update.

Thanks in advance for any guidance.