Major League Soccer clubs efforted to withdraw from the 2024 U.S. Open Cup entirely, and a compromise has been reached where only some clubs will take part this year, while MLS Next PRO will also be involved.
MLS Cup - Wikipedia
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MLS refuse to play in 2024 US Open Cup
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MLS plans to be represented by MLS NEXT Pro clubs in 2024 US Open
Commentary: US Soccer denies MLS' attempt to ruin Lamar Hunt US
MLS, U.S. Soccer reach U.S. Open Cup compromise - The Washington Post
Major League Soccer (MLS) roster rules and regulations: Explained