Our President left our team unexpectedly and for unknown reasons. How can you tell if they’ve moved..

If you are president or an officer, you can tap the club member list and look for them on the invite list (bottom right corner, person with green "+" icon). If they are on the list and they have a green button next to their name, allowing you to invite them, then then are not in a club. If they have a gray button with checkmark, they are currently in a club. If they do not appear on the list, there is no way to tell if they are in a club or not.