Tasks did not appear in the task time window/session, why?

In this situation, usually incorrect task configuration is the cause of the problem. 

The most common incorrect task configuration is in the settings of task cycles and the number of tasks performed.

As far as the the mobile application is concerned, filters or poor internet coverage is most often to blame. If the task does not appear at the scheduled time, it is also worth refreshing the Task List manually by swiping the screen upwards when viewing the Task List.