salmonhalo:
I also played an 18 hole stroke play, LIVE, and no challenge box.
WT?
1) It only works if your "End of game messages" are enabled in the game settings.
2) It only works for ranked rounds, 9 or 18 holes, not for practice.
(not sure about RGs and non-tiered tournaments)
3) After finishing, the friends' list appears and a choice of 10 may be challenged, add 10 XP for each invitation.
4) If their mail address is correct they receive the challenge.
5) Following the link in the mail they may play the same course with their ranked conditions, i.e. different tees for different tiers. (may not apply to non-tiered tournaments)
6) When the invitee has completed his round, he receives 50 extra XPs.
7) A double scorecard is sent to both players, making comparison possible.
Obviously, errors in the mail adresses will interrupt the challenges as well as WGT errors do. There has been report of such error recently, combined with mails from CC events missing.