I didn't receive any email from NVC Research. However, when i asked NVC inquiry first time they told me the petition was received and waiting to enter to the system, but the second time NVC inquiry said they did not receive it. So I inquired 3rd time and they said it was received and waiting to be entered. Also, I reached out to NVC through congresswoman of my district, and NVC said my petition was received November 7th (for your reference my NOA2 is Oct 3rd). Like you said, this is a problem from NVC's end and creating a big confusion. Send another inquiry stating your situation with this confusion and demand a solid received date to see if that's going to work.
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OCTOBER 2022 K1 NOA2 to NVC to EMBASSY
is your NOA2 date based on your I-797 form Notice date or from USCIS case status website?