qlp, 
US Soccer rejects Major League Soccer's move to have MLS Next Pro teams play in the US Open Cup instead of the first team.
MLS sought the moolah with Leagues Cup over US Open Cup.
ESPN: U.S. Soccer rules MLS teams must participate in '24 Open Cup
https://www.espn.com/soccer/story/_/id/39154089/us-soccer-rules-mls-teams-participate-24-open-cup