The prompt "You are only allowed to post to one Twitter account at a time. 1 or more of your Twitter accounts have been deselected" in Social Cloud appears when a user is creating content and attempts to select multiple Twitter/X accounts.

Our platform is designed to meet the policies of the social platforms we publish to. For more information on X/Twitter's policy on posting content to multiple Twitter accounts, please visit their help center: Copypasta and duplicate content policy