You can contact a Mission owner from the Mission page after you claim it, or from More actions on a Mission card.
The contact card shows the owner's name, a LinkedIn message link, and a WhatsApp link when the owner allows WhatsApp contact. WhatsApp appears only if the owner enabled WhatsApp contact sharing in their contact settings.
The owner's WhatsApp number is never shown directly. The link opens WhatsApp instead. When no contact method is available, the contact section stays hidden.
Contact availability follows the owner's privacy choices and the Mission's state.