After you file

@khyrac93 - what tax year is the amendment for?

 

the deadline to claim a refund is 3 years from the original filing date (assuming you didn't file for an extension): 

 

2018 - deadline was April 15, 2022

2019 - deadline is July 15, 2023

2020 - deadline is May 17, 2024

2021 - deadline is April 17, 2025

 

if you filed the amendment past these deadlines, there is nothing you can do; that is the law.  it's just a lesson learned 🙂