Due to the rise in using social media in ways in which it was not intended, Twitter has implemented new anti-spam efforts. Twitter's primary focus is to limit coordinated actions across multiple Twitter accounts to post the same, or almost the same, content.
According to Twitter: "The use of any form of automation (including scheduling) to post identical or substantially similar content, or to perform actions such as Likes or Retweets, across many accounts that have authorized your app (whether or not you created or directly control those accounts) is not permitted."
This change is effective March 23, 2018. Socializer will be enforcing this new requirement in its software. This means that you will not be able to post the same post to multiple Twitter accounts at the same time. The alternative to posting identical content is to retweet content from one account to the other accounts that you wish to share that post to.