Required fields in fillable .pdf

How would I go about creating this error message for grouped checked boxes? I found a way to do it if the textbox isnt completed but I also need it for grouped questions where only one selection is needed. I have this code, that gives an error when the text box isn't completed but it won't give the error when only the checked boxes are skipped over. 

function validateFormFields() {
// Define required text fields (if any)
var requiredTextFields = ["TextField1"]; // Replace with actual text field names

// Define groups of checkboxes where at least one must be checked
var checkboxGroups = [
["CheckboxGroup1_Option1", "CheckboxGroup1_Option2"], // Group 1: At least one must be checked
];

var allTextFieldsValid = true;
var allCheckboxGroupsValid = true;
var invalidMessage = "";

// Check individually required text fields
for (var i = 0; i < requiredTextFields.length; i++) {
var fieldName = requiredTextFields[i];
var field = this.getField(fieldName);

if (!field || field.value.trim() === "") {
allTextFieldsValid = false;
invalidMessage += "Please complete all required text fields.\n";
// Note: Do not break here so we can check all fields and all checkbox groups
}
}

// Check checkbox group requirements
for (var j = 0; j < checkboxGroups.length; j++) {
var group = checkboxGroups[j];
var groupValid = false;

for (var k = 0; k < group.length; k++) {
var checkboxName = group[k];
var checkbox = this.getField(checkboxName);

// Check if checkbox is checked
if (checkbox && checkbox.value !== "Off") {
groupValid = true;
break; // Exit loop if at least one checkbox in the group is checked
}
}

if (!groupValid) {
allCheckboxGroupsValid = false;
invalidMessage += "Please select at least one checkbox in each required group.\n";
// Note: Do not break here so we can continue checking other groups
}
}

if (!allTextFieldsValid || !allCheckboxGroupsValid) {
app.alert(invalidMessage);
return false; // Prevent saving if any validation fails
}

return true; // Allow saving if all validations pass
}

// Add the save event trigger
this.setAction("WillSave", "if (!validateFormFields()) { event.rc = false; }");