That code requires you to set up the form in a specific way, which your form doesn't conform to.
For your particular situation you want
MktoForms2.whenReady(function(mktoForm){
const formEl = mktoForm.getFormElem()[0];
const unsubscribeTrigger = "Unsubscribed",
unsubscribableDeps = [
"subscriptionSalesEngagement",
"subscriptionEducationandInsights",
"subscriptionLivelyProductsandNews",
"subscriptionPersonalizedandSeasonalContent",
"subscriptionMonthlyNewsletter"
];
const dependencies = [
{
primaries : [unsubscribeTrigger],
cascadeSecondaries : unsubscribableDeps
.map(function(unsubscribable){
return { field : unsubscribable, negate : true, filterPrimaryValues : ["yes"] }
})
},
{
primaries : unsubscribableDeps,
cascadeSecondaries : [
{ field : unsubscribeTrigger, negate : true, filterPrimaryValues : ["yes"] }
]
}
];
const mktoNegations = {
"yes" : "no",
"no" : "yes"
};
dependencies.forEach(function(dep){
dep.primaries.forEach(function(primary){
formEl.querySelector("[name='" + primary + "']").addEventListener("click",function(){
const primaryValue = mktoForm.getValues()[primary];
const mktoFormsObj = dep.cascadeSecondaries
.filter(function(fieldDesc){
return fieldDesc.filterPrimaryValues.indexOf(primaryValue) != -1;
})
.reduce(function(acc,nextField){
acc[nextField.field] = nextField.negate ? mktoNegations[primaryValue] : primaryValue;
return acc;
},{});
mktoForm.setValues(mktoFormsObj);
});
});
});
});
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