Hi Shane, My name is Umar and I'd be happy to help you out with your question.
Please note: This is a user-to-user community forum. We are users just like you who help others. We are not employees of Microsoft.
If a newly added student is not appearing in the Class Notebook in Microsoft Teams, there are a few troubleshooting steps you can try:
Ensure that the student has been properly added to the Class Notebook in OneNote. If using Microsoft Teams, check for updates to ensure you are using the latest version, as this may resolve any bugs causing the issue.
For specific instructions on the items listed above, kindly check the link below. https://support.microsoft.com/topic/4da02c45-b435-4af1-921b-51b8ee40e1c9
If your school uses School Data Sync to manage Class Notebooks, verify that the synchronization is running correctly. You can check this with your school IT administrator.
I hope this information is helpful. Please let me know if you have any other questions.
Help the next person who has this issue by indicating if this reply solved your problem. Click Yes or No below.
Best Regards, Umar Majeed