In a private “strategy chat” with more than 40 far-right trolls, one user who tried to create a new Twitter account to spread disinformation ahead of Tuesday’s midterms elections described how he had hit an immediate roadblock: Twitter banned him for deliberately giving out the wrong election date.

“Were they really banning people for saying [vote on] November 7? Lol, whoops,” the user, whose name was a racist joke about Native Americans, wrote. “Maybe that’s what got me shadowbanned.”

The remark, seen by NBC News in a closed chat room used for planning and executing misinformation efforts, suggested that the changes that Twitter has undertaken in the past two years to avoid a repeat of the 2016 U.S. election may be working. Two years ago, the company did little to police misinformation and allowed a Russian influence campaign and politically motivated trolls to thrive.

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NBC News saw some of those accounts in action when an NBC reporter was mistakenly invited to private chats on Twitter and in the gaming chat room service Discord, where some of those talking points and strategies for spreading disinformation were workshopped in the last month.

Many of those strategies, including encouraging Democrats to vote one day after election day, were stopped by an algorithm before they reached users on Twitter.