Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi Ben Nolen ,
Could you please confirm whether you are the IT administrator for the school and whether you're using an email address associated with the school's domain?If you're not the IT administrator, I recommend contacting your school's IT administrator, who can assist with the registration.
If you are the IT administrator, could you try the registration process in an InPrivate/Incognito browser window or a different browser to see whether the same error occurs?
If the issue persists, you may need to contact Microsoft Support for further assistance: Get support - Microsoft 365 admin
You can also try contacting the Microsoft Education Support team directly through the following page: https://support.microsoft.com/home/contact/education
I hope this helps point you in the right direction.