Yep ... now you get to wait for the IRS to process the original return and you have the original refund in hand.
Then and ONLY then may you amend your return to see if you can get any more refund. This year you are lucky that you no longer have to pay back any advance of the PTC however the IRS may send a notice asking for the 1095-A and the 8962 so you MUST wait for the IRS to conclude processing the original return.
