After you file

I found this hope it helps I’m in the same boat as you I got the letter today

combat stolen identity refund fraud
 
The IRS has indicated the 4464C letters are part of the screening program to combat stolen identity refund fraud and do not mean the taxpayer has been selected for audit. Both the IRS and the Department of Justice DOJ Tax Division have increased their efforts to combat stolen identity refund fraud.Mar 1, 2020