The North Carolina State Board of Elections sent letters to over 241,000 voters who didn't provide ID numbers that could be verified when they registered to vote. These voters can still vote normally - their registrations are complete and legal. The letters ask voters to update their records by providing their driver's license or Social Security numbers, or by making sure their name matches other government records.
This helps make voter rolls more accurate but doesn't affect anyone's ability to vote. Voters can update their information by mail (with a pre-paid envelope), online through the DMV website, or in person at their county elections office. If voters don't respond to the letter, they can still vote normally.
Poll workers might ask if they want to provide their ID numbers, but this is voluntary. The goal is to improve record accuracy and prevent duplicate registrations when people move between counties.