What kind of preposition should I use (In your concern OR your concern)?

Question

Question:

What kind of preposition should I use OR both options are acceptable for different cases?

IN or/and '_'

1. It is not in your concern

2. It is not your concern

Answer 1

2 is correct.

If something is my concern, it basically means that I am interested in it or affected by it.

So, something is or is not my concern, and we need no preposition.