Depends on what you did ... did you ever efile the original return ? Did you ever get the original refund ?
Did you start the amendment and make changes ? If so simply "undoing" the amendment ONLY removes the 1040X form from the account but does not undo the changes you made since you filed originally. So if you now need to amend the return that you have already filed you need to UNDO all the changes you made and put the return back to as filed originally filed only then can you start the amendment process again. So when you log back in do NOT click on the amendment option until you have restored the return ... when you log in scroll down and click on ADD A STATE to open the filed 2021 return.
