If you have set it as true and you have the interval with an interval number it will show the tickers with that interval number. But if you don't put any interval and you still have the ticker interval option selected with a number you will not see any tickers because you didn't say the interval you want.

If you have the interval selected it will show at the bottom of the range slider the intervals, in this case, I have put 5 to 5 interval

As you can see in the first image there are 0, 5, 10 and so on...
Let me know if it helps
Regards,
Márcio