I am having the same issue. I filed amended return in May 2020. It took them almost a year to state they received it, but still not processed. In the meantime, because I also filed an amended state return, my state sent me letter stating my transcripts didn't match (because of irs not processing). I had to return the state money with penalties, which I can receive back if the IRS ever processes my return, but I have limited amount of time to do this. I reached out to an IRS advocate service and they are not assisting due to IRS huge backlog. This is beyond ridiculous. Meanwhile I have to turn around and write them a check this year.
