Deductions & credits

I have same codes with 570 code saying 3-2-20 as well. When i called irs, they told me my return is under review and i will have a notice sent to me on 3-2-2020 with explanation and if i need to send anything in it will be on there. They told me they couldnt tell me anything else but i have to wait for the letter respond if need be and then wait some more to (45-60 days) to get my return. Which is really aggrivating because i pulled last years return and compared to this year and nothing changed except the amount im getting back from the additional child income credit. Exactly everything else is the same.