Refile or Submit Amendment?

I used TurboTax Premier 2021 to complete my taxes on April 10th. I selected the delayed submission (April 18th) option since I owed taxes.  I discovered afterwards that I had missed reporting some income.  It's May and I started an Amended Return (1040x). I tried to e-File the Federal Amendment, TurboTax 2021 says that I haven't e-filed through TurboTax. I reviewed my emails and I didn't receive a confirmation for my initial 1040.

How do I confirm TT submitted my initial 1040? Should I refile the 1040? Should I mail the 1040X?