Twitter is hiding all content behind a login now: https://www.reuters.com/technology/twitter-now-needs-users-sign-view-tweets-2023-06-30/

These changes sadly spell the end for 3rd party front-ends like Nitter: https://github.com/zedeus/nitter/issues/919

Changing Nitter to support login data or cookies could work, but it’s unclear how viable that is.

RIP nitter.pufe.org for now :(