How do I call clearInterval from multiple places in my application?

I have a countdown timer that I need to reset from more than one place in my React Native application. I have a service function that returns my updated time string and a variable that the setInterval function is saved to via callbacks returnCountDown and returnSetInterval:

export const getCountdown = (callLength, returnCountDown, returnSetInterval) => {
  let callLengthInMs = Date.parse('1970-01-01T00:' + callLength + 'Z')
  const interval = setInterval(() => parseTimeString(), 1000, returnCountDown)
  const parseTimeString = () => {
    callLengthInMs -= 1000;
    const timeLeft = new Date(callLengthInMs).toISOString().slice(14, -5)
    returnCountDown(timeLeft);
  }
  returnSetInterval(interval);
}

Then in my function component I save the returned setInterval function to state and call it under a certain condition, but clearInterval does not work:

const CountDown = () => {

  const [time, setTime] = useState(null);
  const [callInterval, setCallInterval] = useState(null);
  const callLength = useSelector(state => state.videosession.callLength);

  useEffect(() => {
    getCountdown(callLength, returnCountDown, returnSetInterval);
  }, []);

  const returnCountDown = timeLeft => {
    setTime(timeLeft);
  }

  const returnSetInterval = interval => {
    setCallInterval(interval)
  }

  time === '00:05'&& console.log('00:05 HIT') && clearInterval(callInterval); // does not work.

How can I achieve being able to call clearInterval via an exported module if this is not the correct approach?

Many thanks in advance! :)

Update

When I console.log(typeof interval) I get number. This is the variable that is assigned to setInterval