Do US-born citizens have USCIS Online Account Number?

I am losing my mind because of this, I have looked everywhere and there is simply no USCIS Online Account Number. I submitted 2 I-130 applications, received 2 notices per application, both receipt notices contain IOE letters in the start of the receipt numbers, but no Online Account Number. I checked both the PDF and the versions I received in mail (I-797C) and nowhere at all does anything have the Online Account Number. I checked in Profile, it isn't there. It isn't in any notices, it isn't in any documents I received. I have no "account creation" notices.

Everywhere I read, it says when you submit an I-130 application online, you will get a number. Is that strictly for non-US-born citizens/nationals? Can a US-born citizen have such a number?