GAS insert emoji into a table - google-apps-script

Question

I am sending an email that contains a table.
The output is a table in the email where the first column should be the emoji follow by the name and date.
When I tried to put the emoji into the column of my array, the output in the column 1 of the table is a black ? triangle.
My code snippet is below -
for (let indx =0; indx<empDates.length; ++indx){
if (empDates[indx][startMonthIndx]!="") {
var tempDate = new Date(empDates[indx][startMonthIndx+1]);
if (tempDate.getMonth() >= monDate.getMonth() && tempDate.getDate() >= monDate.getDate() && tempDate.getMonth() <= sunDate.getMonth() && tempDate.getDate()<= sunDate.getDate()) {
var emojiType = empDates[indx][startMonthIndx];
if (emojiType.indexOf("(B)")==0) {
var emojiIcon = '🎂';
} else {
var emojiIcon = '🎉';
}
thisWeekReminder.push(emojiIcon, [empDates[indx][startMonthIndx], empDates[indx][startMonthIndx+1]]);
}
if (startMonth != endMonth) {
tempDate = new Date(empDates[indx][startMonthIndx+3]);
if (empDates[indx][startMonthIndx+2]!="") {
if (tempDate.getMonth() >= monDate.getMonth() && tempDate.getDate() >= monDate.getDate() && tempDate.getMonth() <= sunDate.getMonth() && tempDate.getDate()<= sunDate.getDate()) {
var emojiType = empDates[indx][startMonthIndx];
if (emojiType.indexOf("(B)")==0) {
var emojiIcon = '🎂';
} else {
var emojiIcon = '🎉';
}
thisWeekReminder.push(emojiIcon, [empDates[indx][startMonthIndx+2], empDates[indx][startMonthIndx+3]]);
}
}
}
}
}
const htmlTemplate = HtmlService.createTemplateFromFile('emailTable');
htmlTemplate.name = name;
htmlTemplate.specialDate = specialDate;
htmlTemplate.tablerangeValue = thisWeekReminder;
const htmlForEmail = htmlTemplate.evaluate().getContent();
var toEmail = emailAddr[0][0];
var ccEmail = "";
for (let i=1; i<emailAddr.length; ++i) {
if (emailAddr[i][0] != "") {
if (i=1) {
ccEmail = emailAddr[i][0];
} else {
ccEmail = ccEmail + "," + emailAddr[i][0];
}
}
}
MailApp.sendEmail({
to: toEmail,
cc: ccEmail,
subject: "REMINDER: This week's Birthdays and Anniversaries",
htmlBody:htmlForEmail
});
}
}