Look at the error messages a lot of them are issues with the time format. The timeFormatter isn’t meant for use with the Break/Session lengths, I would also suggest you move the function definition out of the render method.
You seem to be using code from the example project, which I wouldn’t suggest doing.
Best case scenario, but still bad. You are using code you didn’t write which makes it harder for you to understand and use correctly. Worst case scenario, it may be seen as a violation of the Academic Honesty Policy.
Getting some inspiration and borrowing a little code isn’t the end of the world, but you should be careful how you do it.
I made some minor changes to the code concerning Break/Session lengths and the timeFormatter following your suggestions. There are still, however, 4 tests out of the 29 that I am unable to pass even though they are clearly being passed if checked visually - e.g. one of the unpassed tests is: "break length cannot be = or less than 0, and my pomodoro clock doesn’t allow the break length to be = or less than 0.