I think you will have to file an amended return, but I'm not 100% sure. However, if you do have to file an amended return, you should not file it until after the IRS has made its adjustments and you have gotten the additional refunds. So wait until you get the refunds for the unemployment exclusion and the excess APTC. Then, if the IRS did not give you the net PTC, you can file an amended return at that time to get it.
