Troll entered my meeting i have every thursday.

Hello @LindaMid – I would suggest investigating who this individual is via Reports. Account Management > Reports > Usage Reports > Meetings & Webinars History > Search for the meeting ID in question > open the Participants. From here, you should be able to track down this person's email domain if available. You can then add this domain to the block list (Settings > Meeting > Security > Block users in specific domains from joining meetings and webinars) to prevent them from joining your existing meetings.

In case the email domain isn't available, I would suggest scheduling a new meeting and enabling at least 1 security option (Passcode, Waiting Room, "Only authenticated users can join meetings") to keep your meetings private / secure.