Several things:
1) If it’s the same letter my son received, it specifically stated that a paper return should be printed, signed, and mailed in.
2) But, further guidance from the IRS says to no do anything, if the return was in fact filed. They are very far behind, and this letter was generated for a situation that rarely occurs in “normal” times. See:
https://www.irs.gov/individuals/understanding-[product key removed]e
I hope hope this helps you move forward.
