Thanks for explaining the school district's constraints. We understand that staff should be able to use district-issued equipment rather than be required to provide a personal phone.
The iPad restriction was part of the old Microsoft 365 Copilot secure release implementation. Since your post, the new Universal Print portal has become available and supports compatible iPads and other tablets through a browser.
For commercial customers: https://print.cloud.microsoft.
On a district iPad, open the portal in your organization's approved browser, sign in with the work account, and select Secure release to use the in-portal QR scanner. No separate Universal Print app or PWA installation is required. Existing device, browser, and camera policies still apply.
If this does not work on your iPads, please share the iPadOS/browser versions and what fails through Microsoft Support so the specific configuration can be investigated.