I amended my 2021 return and sent via certified mail. It arrived on March 30th. I have checked the IRS "Where's my Amended Return" tool every week since and it is still not in the system. https://www.irs.gov/filing/wheres-my-amended-return. The page says "Your amended return will take up to 3 weeks after you mailed it to show up on our system.".
Do I just keep waiting? Or send another return? I'm not sure what to do.
continue to wait - they have it...
Status of Processing Form 1040-X, Amended Individual Tax Return: As of May 13, 2023, we had 1.43 million unprocessed Forms 1040-X. We are processing these returns in the order received and the current timeframe can be more than 20 weeks. Please don't file the same return more than once. Taxpayers should continue to check Where's My Amended Return? for the most up to date processing status available.