Upon further research, looks like this may be the issue?https://ttlc.intuit.com/community/amending/help/can-i-e-file-my-1040x-to-amend-my-return/00/260081040X w...

Good to know on the single e-file of the 1040-X! I don't plan to make another mistake 😉 I've only done one e-file and that was the original one. Anytime I atte...