Twitter API URL – Page not found

Hello!

This has been driving me nuts, but twitter will not authenticate and continues to go to what looks like pages or page that do not exist. All of the API pages look to not exist (they do) and do not load.

Stuck with a link that looks like this; https://api.twitter.com/oauth/authenticate?oauth_token=xxxxxxx

All other socials work great.

Any help would be amazing,
Jimmmy