Hi @Jessie Mundy,
Welcome to the Microsoft Q&A forum.
Thank you for reaching out regarding the issue with students still being able to start new chats in Microsoft Teams despite having a restricted messaging policy assigned.
I understand how important it is to ensure that the correct settings are applied, particularly in an educational environment, and I sincerely apologize for any inconvenience this situation may have caused.
To ensure we resolve this securely, I have initiated a private message for your convenience and left a note there. At your earliest availability, please review that message so I can assist you more affectively.
To access your private messages, sign in to the Q&A forum using the account you used to post your question. Then, navigate to the Private Messages section to view and respond.
Thank you for your attention to this matter. I look forward to your response.