Dear DEAN WEBBER,
Thank you for writing to us. To help further trouble shoot the issue, first I would like to confirm what is the school license you are using? Some school license like Microsoft 365 A1 does not includeability to use the desktop applications and might cause such problem. Could you please check your subscription type by logging into the My Account page with your school account?
If your subscription is Microsoft 365 A1, it provides access to the web versions of these apps only and might cause the problem that you cannot create new notebooks from your desktop client or sync successfully with online.
See the related Article for your reference. Microsoft 365 Education - Service Descriptions | Microsoft Learn
Please let me know if your subscription is different or if you need further assistance.
Sincerely,
Sophia