Ugh. It's all very concerning. Using a service that guarantees accuracy yet doesn't alert a signature missing. I know I didn't e-sign or date but I created a pin years ago so I hope that to be my saving grace. Though I know I didn't enter it before sending. I did however enter my identification information to aid in the additional security. I got the confirmation stating my return was accepted. So who knows.
It shouldn't be concerning at all. As stated numerous times above you do not sign an e-filed return. There is no signature for an electronically filed return. You don't require a "saving grace" of any sort. (TurboTax often has the data necessary from the prior year if you e-filed then as well and doesn't require you to enter any more than necessary to complete the identification process.)
It can't be accepted if the criteria that equate to a signature are not there, so clearly your return met that criteria or the return would have been rejected.
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