Hi Kevin Neve,
If you only want to let others can’t join the meeting before the meeting starts, you could set it when you schedule this SFB meeting in Outlook as below:
After you create a new SFB meeting item in Outlook client, then click Meeting Options. In the Permissions tab, choose “Only me, the meeting organizer” for the “These people don't have to wait in the lobby” Option. After doing this, all users click the meeting
URL will stay the lobby, after you allow them to join the meeting, they will join it. You could refer to the following screenshot:
You could also refer to the following official document to find details about
Set options for online meetings and conference calls.
Best Regards,
Evan Jiang
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