Here is the story from The Washington Post. It may be behind a paywall.
The jist of the story is that the American Values 2024 Super PAC spent $2.4 million to gather signatures in Michigan, Arizona, South Carolina & Georgia, but that none of the signatures will be turned over to the Robert F. Kennedy, Jr. for President Campaign, so as to not appear to be coordinating actions with the Campaign, which would be illegal.
RFK, Jr. has since been nominated for President by the Natural Law Party in Michigan, so his Campaign does not have to petition there. But, the Campaign is planning to redo the Arizona, South Carolina and Georgia petitions. The signature requirements for those three petitions are 34,116 signatures as a new party or about 43,000 as an Independent candidate in Arizona, 10,000 in South Carolina, and 7,500 in Georgia.