Yesterday I did the Pretzel (Medio Fondo) and due to login problems I was just able to join the event about 90 secs for the start and ofcourse due to that I forget to accept the Mission. Result => Climbing meters are not counted. Since I just realized I forgot I enrolled and saw no hms added.
My opinion is that it is a real shame that any effort just prior to enrolling the mission is not counted for. Sometimes just for a reason people forget to enroll for a mission.