It seems broken for client apps. I'm mostly just posting this to test whether my backend flow is broken, too.
https://9to5mac.com/2023/01/13/tweetbot-twitter-apps-still-broken-elon-musk-api/
Update: the flow via Azure Logic Apps still works. This is the tweet:
https://twitter.com/clemensv/status/1614530435295354880?s=46&t=E1XsnipMk6e5612Q1r5hJw