Additional team and channel-related features and issues within Microsoft Teams for Education
Hi Ali_1920,
It is not feasible to prevent from all students to join into a PLC team if this is public. As a workaround, we recommend you make the PLC team to a private PLC team and share the code or invitation link only to your co-workers. Students couldn’t join into it in this way unless the team owner accepted it.
I hope this can help. Please feel free to let me know if you need any further assistance.
Best Regards,
Sylvie