Why was mike Tyson not in the hangover part 3?

Mike Tyson did not appear in "The Hangover Part III" primarily due to a shift in the film's storyline, which focused less on the wild antics associated with the previous films. The filmmakers opted for a different direction that moved away from the first two films' structure, leading to fewer cameo appearances by characters like Tyson. Additionally, Tyson's participation may have been limited by scheduling conflicts or creative decisions.