Additional features, settings, or issues not covered by specific Microsoft Teams categories
Hi Teacher4382,
Based on your description, if you are using Teams desktop client, you may double confirm if you turn on new meeting experience. Go to your profile picture > Settings > select Turn on new meeting experience
After you change the setting, restart Teams so the changes take effect:
On Windows, right-click the Teams icon in the taskbar > Quit. Then open Teams again.
On Mac, Ctrl+click the Teams icon > Quit. Then open Teams again.
For more information please see Get a preview of new meeting features
Moreover, you can sign in Teams web app to see if you can find the option there. Besides, contact your admin double check if admin changes any policy for you.
If above method not working, please provide an issue screenshot of your Teams interface for further analysis.
Regards,
Grace