I had the same issue, but I checked my bank statements, and the IRS website which stated I should have received the 3rd payment March 17th 2021, which I didn’t, and to be sure I checked from statements March-May and did not see a deposit of $4,200. Plus all the things it listed in the letter you received, I received and it doesn’t apply. I feel like it’s an IRS error. It’s so hard to get ahold of them through the 332 ext they give. It’s a very frustrating situation.
