Twitter has suspended WordPress.com's access to the Twitter API without warning. I believe this means that WP.com users can no longer auto-tweet their published posts from within their WP dashboard.

#Automattic, which owns both WordPress.com and #Tumblr, are taking this as an opportunity to convince Twitter users to switch to Tumblr. en.blog.wordpress.com/2023/04/…

Why Twitter Isn’t Working With Your Blog (Right Now)

Changes at Twitter have broken auto-sharing. We’re working on it.

^{Automattic (WordPress.com News)}