Jetpack, a service operated by Automattic, the company behind WordPress, has informed its users via email that they will no longer be able to utilize the Twitter auto-sharing feature built into WordPress as of May 1, 2023.
It appears that Jetpack has had their Twitter API suspended, as Twitter has recently altered the terms and pricing of their API, which is necessary to maintain the auto-sharing functionality.
Jetpack has addressed these issues by publishing a blog post on their website, informing users about the changes and their implications.
https://jetpack.com/blog/the-end-of-twitter-auto-sharing/
If you wish to continue sharing your WordPress blog posts on Twitter, you may need to manually share the link to your post on Twitter or explore alternative services, provided they are reliable.