Ideas
As the title suggests I cannot complete my Daily Tasks because I just don't have enough Sessions in this case. I must complete at least 2 goals in a Session 4 times but I have ran out of available Sessions and redoing already-completed challenges does not fulfill the task. By the time the challenges refresh, the Daily Task will have also refreshed so I am uncontrollably missing out on Tix and reputation.
I have the exact same issue today.
The daily task should either allow completed challenges to be recompleted, or it should make sure there are sufficient open challenges available to complete the task.
Other comments about requiring more challenges in general because of 'nothing to do' are off-topic and sound like luxury problems to me. I have about 1 to 2 hours to play on most days. I am swimming in available challenges. Yet still not enough 'slam' challenges to complete my daily today.