Can't make it up.
TIME reports in an exclusive:
For three weeks in August, as election officials across the country were preparing to send out mail-in ballots to tens of millions of voters, the U.S. Postal Service stopped fully updating a national change of address system that most states use to keep their voter rolls current, according to multiple officials who use the system. A USPS spokesperson acknowledged the failure in response to questions from TIME, and said that at least 1.8 million new changes of address had not been registered in the database.
TIME also noted that several states they contacted had no idea of their mistake, and that at least 43 states plus DC us the USPS change of address database, including battleground states like Florida, Ohio, Pennsylvania, and Wisconsin.