In 2018, Facebook rolled out an update that removed the ability to automatically post tweets to your Facebook profile. However, you can still use third-party tools to post and interact with Facebook Pages. Below are your only options for automatically syncing your X (formerly Twitter) and Facebook posts.
How to Automatically Share FB Page Posts with X
If you have a Facebook page that you want to update with every new tweet you make, you can convert your tweets into an RSS feed and import the feed into a service that will automatically post the content to your Facebook page.
These are the basic steps:
Create an RSS feed from your profile using a tool like RSS.app.