CORS ISSUES INCONSISTENT - 2 Examples (VueJS and NodeJs) - node.js

Question

I have the following axis post request
EXAMPLE 1
Front End
let data = this.itemsDuplicated;
console.log("length",data.length)
await axios({
method: "post",
url: `${url}/upDateTasksFromProgress`,
data: data
})
.then(response => {
console.log(response.data);
})
.catch(e => {
console.log(e);
});
Node
router.post("/upDateTasksFromProgress", (req, res) => {
let mysql = "";
req.body.forEach(el => {
mysql = `${mysql} update tasks set startDate = '${el.startDate}', endDate = '${el.endDate}', duration = ${el.duration} where id = ${el.id};`
});
console.log(mysql)
pool.getConnection(function (err, connection) {
if (err) {
connection.release();
resizeBy.send("Error with connection");
}
connection.query(mysql, function (error, result) {
if (error) {
console.log(error);
} else {
console.log(result)
res.json(result);
}
});
connection.release();
});
});
This works fine.
I also have:
EXAMPLE 2
Front End
let data = [];
this.tasks.forEach(el => {
let insert = {
id: el.id,
startDate: el.startDate,
endDate: el.endDate,
duration: el.duration,
parentId: el.parentId,
dependantOn: el.dependantOn,
fix: el.fix
};
data.push(insert);
});
console.log(data.length)
await axios({
method: "post",
url: `${url}/postTaskUpdates`,
data: data
})
.then(response => {
console.log(response.data);
})
.catch(e => {
console.log(e);
});
}
Back End
router.post("/postTaskUpdates", (req, res) => {
let mysql = "";
req.body.forEach(el => {
mysql = `${mysql} update tasks set startDate = '${el.startDate}', endDate = '${el.endDate}', duration = ${el.duration}, parentId = '${el.parentId}', dependantOn = '${el.dependantOn}' where id = ${el.id};`
});
pool.getConnection(function (err, connection) {
if (err) {
connection.release();
resizeBy.send("Error with connection");
}
connection.query(mysql, function (error, result) {
if (error) {
console.log(error);
res.json(error)
} else {
console.log(result)
res.json(result);
}
});
connection.release();
});
});
The second example gives me the following error:
“Access to XMLHttpRequest at
'https://www.testing-be.co.za/postTaskUpdates' from origin
'https://www.testing-fe.co.za' has been blocked by CORS policy: No
'Access-Control-Allow-Origin' header is present on the requested
resource.”
Both are in the exact same Route File on the backend.
The only difference is the number of records.
In the first example there are 22 records.
In the second there are about 1300 records.
Besides the number of records, all else is as shown above and to my mind exactly the same.
Any suggestions would be greatly appreciated.