!Friendica Support !Friendica Admins If your system is on the "develop" branch and recently updated their code, then you will be able posting to Twitter again. The Twitter addon now is only a posting connector, since for everything else you have to pay. Also, since there are now low posting limits, each user has to register their own app.
Head over to the Developer Portal https://developer.twitter.com/en/portal/projects-and-apps for that purpose. If you already have got an app registered, make sure that it belongs to a "project" and is no "Standalone App". In the section "Keys and Tokens" you will then find all the needed data, means "API Key and Secret" and "Access Token and Secret". These values have to be added in the Twitter settings in their respective fields.
When you submitted the values, have a look at the field " Last Status Summary". This should show some "200 - ..." value. If the number is in the 400 or 500 range, then something is wrong with your keys.
Later that field will contain the result after each post, so expect to see "201 - Created" in that field after the first post is done. Again: If the value is not in the 200 range, then something is wrong. Then have a look at " Last Status Content" to see the details.
Have fun!