Hey @jack2020 – are you using any plugin to block REST API access for the site, or might your hosting provider has blocked it for your site. If so, could you please enable it or reach out to your hosting provider and ask them to enable it for you?
One more thing I noticed is I can’t load the XML-RPC URL for your site here: https://www.example.com/xmlrpc.php (replace “example.com” with your domain) – it automatically redirects me to https://www.example.com which is also an issue. Ideally, if XML-RPC is working, then we should see the URL loading like here: https://jetpack.com/xmlrpc.php.
This file is used by Jetpack and other plugins and apps to connect to your site. If you want to know details about XML-RPC and how it helps Jetpack, you can check our detailed guide here.
For this issue as well, you can connect to your hosting provider and enable the XML-RPC for the site as well.
Let me know how it went!