I am having trouble simply changing the y-axis limits from the previous developers’ callback.

$("#simpleGraphs,#detailedGraphs").on('change', '.yRange', function (event) {
    var viewindex = event.target.id.split("-")[2];
    // This works for this part
    views[viewindex].dygraph.updateOptions({
        valueRange: [$("#y-min-" + viewindex).val(), $("#y-max-" + viewindex).val()],
    }, false);
    let currentValueRange = views[viewindex].dygraph.getOption('valueRange');
   
    // This does not work and thus the y-axis limits are not changed
    // Previous developers’ comments
    // update y range selectors to match the new zoom level  The dygraph may actually adjust what we passed in - based on pixels or to make sure all the points are included
    // so need to ask it what it actually set, not just what we passed.
    let y_min = views[viewindex].dygraph.yAxisRange(0)[0];
    let y_max = views[viewindex].dygraph.yAxisRange(0)[1];
    y_min = currentValueRange[0];
    y_max = currentValueRange[1];

    # this works to reset the UX controls
    $("#y-min-" + viewindex).val(y_min);
    $("#y-max-" + viewindex).val(y_max);
});

I have tried about 20 ideas, both mine and A.I.-suggested.
The y-axis limits did not change.
Any ideas would be appreciated.