For a list of whatsapp groups, see https://whatslinkhub.com/chess-whatsapp-group-links/
Disclaimer: I haven't verified the groups myself. Even groups not related to chess seem to be included. Check the group at your own discretion (e.g.: some of the invite links listed are outdated).
https://chat.whatsapp.com/HQmC3Owmw8ZKiQC9tJXWhW