This was one of the issues in 2020. If a person voted in person, but a mail in ballot was received that mail in ballot was just rejected. Lots of politicians fr

This was one of the issues in 2020. If a person voted in person, but a mail in ballot was received that mail in ballot was just rejected. Lots of politicians from one party were adamant about telling people who voted by mail to show up in person as well because the mail in ballots may not arrive in time. So there were millions of people with double votes where the mail in was auto-rejected. When analyst tried to nail down exact numbers or to audit specific instance it turns out the rejections we're not logged. The best they could do was determine, in some states, the number of people who requested absentee, but voted in person. When contacting these people many claimed they did not request or receive the mail in ballot.