The official Play Pokémon Twitter account announced that at the end of the 2022 Season, Pokkén Tournament DX will no longer be part of the Play Pokémon program. Interest and attendance was pretty low this year due to the game not being supported very well.

Play Pokémon Tweet - May 26th, 2022

When the 2022 Season concludes, Pokkén Tournament DX will no longer be part of the Play Pokémon program.

We acknowledge this game’s incredible community & its unwavering support. Thank you for creating great moments and memories with us throughout the years.

Pokkén is powerful!

Source: https://twitter.com/playpokemon/status/1529900210129973256