Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Tony,
Really sorry to convey that as the PowerShell commands also failed to turn on the self sign up feature for your school, forum engineers here may have limited support resources to further suggest, and please open a support ticket in Admin Center so that the escalated support team there will be able to further support as engineers there have the support resources like accessing and collecting the logs from the background to check on the process has been failed in which exact step and help to resolve the issue for your organization. See: Get support - Microsoft 365 admin | Microsoft Docs
Sorry that forum engineers here have no permission to collect the logs from user's end. Your understanding is highly appreciated and hope the issue can be further investigated and resolved by the online support team there.
Best Regards,
Mia