Tagdiv composer not saving any changes

I’ve installed the newspaper theme. I tried editing the front page with tagDiv composer, whenever I click the save button no of the updates are saved. I disabled all the plugins except the tagDiv ones but still no luck. I’ve inspected the network activity in the browser and found out “/wp-json/td-composer/save_post?uuid=a29a6079-b4ff-39ee-5970-0c0a51c3e685” returns a 404 status. I’ve not installed any firewall and caching plugin. Here is an image which will help you to understand my problem better.
Image Link: https://drive.google.com/file/d/1ypUOACqXS7WBA8_MQrrSyJSfG1sLS-l8/view?usp=sharing
Project link: https://krayonmag.com
Error Message:
{
“code”: “rest_no_route”,
“message”: “No route was found matching the URL and request method.”,
“data”: {
“status”: 404
}
}