I’ve noticed an issue where households that have multiple teens only follow one teen when I go to high school. On top of that, they can’t leave to go to their after school activities. I have to travel to another lot in order for them to be able to leave for their activities and jobs.
The second has one too but the thread is also about only one Sim being able to go. Can neither of them go to afterschool activities for you ?
The first probem is a known issue. Have a look at the bug report on EA Answers and click the Me Too button on the first post. I don't know if anyone has found a workaround but that's where you are most likely to find one if someone has. School daily tasks not appearing for all teens
