I'm wondering this option is available in Teams admin center yet and just not obvious or if this is an area where there still isn't parity between Skype admin center and Teams.
The option is in the red box on the image attached in the Skype admin center.
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Teams admin - meetings setting page.
Meeting policies have the other options, so you can set those per person/group.
Also, when you start a meeting, you can create an anonymous link and send it to whomever you want, if you want to notify them.