Hello Annie,
My name is EngineTyme, an Independent Advisor and a Microsoft user like you and I would be glad to help you.
I understand that you are unable to share screen in Teams meeting.
Users can enable screen sharing for sharing content on call and in meetings using the regular in-app flow when they first try to screen share, but this requires they restart new Teams. The user needs to drop from the meeting. Alternatively, users can turn on permissions for screen recording under system settings.
For Monterey OS:
Open macOS System Preferences.
Go to Security & Privacy > Privacy tab > Screen Recording.
Select the + sign to add Microsoft Teams (work Preview) to allow recording content of your screen.
For macOS Ventura
Go to Privacy & Security > Screen Recording.
Switch the toggle for Microsoft Teams (work preview) to Allow recording of the content of your screen.
New Teams for Mac - Overview and prerequisites: https://learn.microsoft.com/microsoftteams/new-teams-mac-install-prerequisites
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Please let me know if you have any questions or concern.
Best regards,
EngineTyme.