"Duplicate of One That Was Previously Received" Error Message

[JOFI]

I e-filed a TY 2021 return for a client in 2022.  In July 2023, I e-filed an amended return for TY 2021.  Further changes were needed and I attempted to e-file a second amended return today when the e-filing window opened again.

I initially received an error message indicating I needed to change the e-file date to the current year.  I did that, and filed it again.  I then got the following error message:   "The submission is a duplicate of one that was previously received.   Please contact customer support."

Has anyone received this error message?  Any ideas on what I should do here?  I tried resaving the file with a new name, but am still getting the same error message.

[Just-Lisa-Now- · Accepted solution]

To EF a second amended return you need to mark an additional checkbox on the EF Info Worksheet telling the program that its a second amended return, could that be the hang up?

[JOFI]

Thank you so much!  This was the first time I have electronically filed a second amendment to a return and had no idea that box even existed!

The return went through and I am now just awaiting final IRS acceptance.