Interactive Video

Hello

I am working at a school and want to use H5P (interavtive videos) also for assessments. I tried to simulate an assessment on Moodle with the introduction video from this website. At the end of the video participants should do a summary of the seen content. For an evaluation you need to press the star icon and submit answer. You can check now the submitted answers and see the score. So far so good. 

Closed captions option is not showing in mobile phones the first time the "options" (the three dots) is pressed. The second time it shows but it only fades and nothing happens after pressing it. Subtitle language not showing up in mobile view.

I have an interactive video with a couple of fill in the blank activities and a function call at the end of an interactive video. However, the function is called several times.
My issues is that   IsAnswered && contextIsIV (see code below) is returning true for every IV activity and not just at the end of the video.

How do I only call the function after the user has ended the video and has completed at least one activity.

Here is my code: